# YouTube thumbnail size: dimensions, file rules and design tips Canonical: https://postmesh.app/blog/youtube-thumbnail-size By PostMesh team. Published 2026-10-31; updated 2026-10-31. YouTube recommends 3840 × 2160 pixels (16:9) for video thumbnails, with a minimum width of 640 pixels, in an image format such as JPG or PNG. Files can be up to 2 MB when you upload from a phone and up to 50 MB from a computer; Shorts thumbnails are 2160 × 3840 (9:16). A thumbnail is the first thing most people see of your video, and it's often seen very small: in a grid on a phone, in search results, or in the list beside another video. Getting the size right is the easy part. The harder parts are passing YouTube's file rules, turning on custom thumbnails for your channel, and designing an image that still makes sense at the size of a postage stamp. This guide covers all of it from YouTube's own help pages, checked on October 31, 2026. ## The short answer Make a 16:9 image at 3840 × 2160 pixels, save it as a JPG or PNG, and keep it under 2 MB if you might upload it from your phone. If 3840 × 2160 is too heavy for your tools, 1920 × 1080 or 1280 × 720 are also 16:9 and well above YouTube's 640-pixel minimum width. Your account has to be verified before YouTube lets you upload a custom thumbnail, which for most channels means confirming a phone number. - 3840 × 2160: Recommended size for video thumbnails (16:9) - 640 px: Minimum width for a video thumbnail - 2 MB: Largest video thumbnail file from a phone - 50 MB: Largest thumbnail file from a computer *From YouTube Help's thumbnail page, checked October 31, 2026.* | Thumbnail for | Recommended size | Minimum | Aspect ratio | Largest file | | --- | --- | --- | --- | --- | | Regular video | 3840 × 2160 px | 640 px wide | 16:9 | 2 MB on mobile, 50 MB on desktop | | Short | 2160 × 3840 px | 640 px high | 9:16 | 50 MB (desktop only) | | Podcast playlist | Not stated | Not stated | 1:1 | 10 MB on mobile, 50 MB on desktop | Every number in that table comes from [YouTube Help's thumbnail page](https://support.google.com/youtube/answer/72431). YouTube doesn't publish the exact pixel size each thumbnail is shown at on each screen, and it changes with the device and layout, so design for clarity at a small size rather than for one display size. ## What size should a YouTube thumbnail be? For a regular video, 3840 × 2160 pixels. That is the size YouTube's help page lists under resolution, and it's the same shape as a 16:9 video, so the thumbnail fills its frame without black bars or cropping. The help page describes it as the size to use, not a hard requirement: anything 16:9 and at least 640 pixels wide uploads. ### Why 3840 × 2160 and not 1280 × 720? For years the common advice was 1280 × 720, and you'll still see it in older guides. YouTube's current page recommends the larger 3840 × 2160, which is three times 1280 × 720 in each direction, or nine times the pixels. A bigger image holds up on large screens such as TVs and on high-density phone displays. If your design software or source photo can't reach 3840 pixels wide, a sharp 1920 × 1080 image is better than a soft one scaled up to 4K, because enlarging an image doesn't add detail that wasn't there. There's one practical reason not to go below 1280 × 720. YouTube's [Test & compare page](https://support.google.com/youtube/answer/13861714) says that if any thumbnail in an A/B test is below 720p (1280 × 720), all the thumbnails in that test are downscaled to 480p. If you ever plan to test thumbnails, keep every version at 1280 × 720 or larger. ### What's the smallest thumbnail YouTube accepts? 640 pixels wide for a video thumbnail, and 640 pixels high for a Shorts thumbnail. At 16:9, a 640-pixel-wide image is 640 × 360. It will upload, but it looks soft on a TV or a large monitor, so treat it as the floor rather than a target. ### 16:9 sizes that work Any of these keeps the 16:9 shape. Divide the width by 16 and multiply by 9 to get the height for any other width. | Width × height | Pixels | Good for | | --- | --- | --- | | 3840 × 2160 | About 8.3 million | YouTube's recommended size | | 2560 × 1440 | About 3.7 million | A sharp middle ground, easier to keep under 2 MB | | 1920 × 1080 | About 2.1 million | Full HD, a common export size in editing apps | | 1280 × 720 | About 0.9 million | The lowest size that keeps A/B tests at full quality | | 640 × 360 | About 0.2 million | YouTube's minimum width; avoid if you can | > If your image isn't 16:9, it won't match the 16:9 shape YouTube recommends, and you give up control of how it's fitted. Crop it to 16:9 yourself so you decide what's cut. ## What file format and file size can a thumbnail be? YouTube's page says to use image formats such as JPG or PNG. The file size limit depends on where you upload from: - On mobile: up to 2 MB for a video thumbnail, or 10 MB for a podcast thumbnail. - On desktop: up to 50 MB for video, Shorts and podcast thumbnails. JPG suits photos and anything with gradients, and it compresses much smaller than PNG. PNG keeps flat colors and text edges crisp, but a 3840 × 2160 PNG with a photo in it can easily be several megabytes. If you're unsure, export a JPG first and look at the text edges up close. If they look smudged, try a higher JPG quality before switching to PNG. ### How do I get a 4K thumbnail under 2 MB? The 2 MB phone limit is the one people hit, because a detailed 3840 × 2160 image often lands above it. You have three ways to bring it down, and you can combine them: 1. **Lower the JPG quality a little**: Most editors have a quality or compression slider. Drop it a step at a time and compare the result at 100% zoom. Text and faces show compression first. 2. **Reduce the dimensions**: 2560 × 1440 or 1920 × 1080 are still 16:9 and hold far fewer pixels than 4K, so they come out much smaller at the same quality. 3. **Upload from a computer instead**: The desktop limit is 50 MB, so a large file that fails on your phone usually uploads fine in YouTube Studio on a computer. The 2 MB figure matters outside YouTube's app too. Some upload tools cap thumbnails at that size. [PostMesh](/platform/youtube), for example, accepts a custom thumbnail as a JPEG or PNG under 2 MB when it uploads a video for you, so it's worth exporting at a size that fits before you schedule. ## Why can't I upload a custom thumbnail on YouTube? Almost always because the account isn't verified yet. YouTube's thumbnail page says you can upload your own thumbnail if your account is verified, and the [feature eligibility page](https://support.google.com/youtube/answer/9890437) lists custom thumbnails as an intermediate feature, alongside videos longer than 15 minutes, live streaming on a computer and creating a podcast. To get intermediate features, you verify your phone number. YouTube's [verification page](https://support.google.com/youtube/answer/171664) says you enter a phone number and Google sends a code by text or voice call, which should arrive immediately. If a text hasn't come after a few minutes, try the voice call option. You can start at youtube.com/verify. ### How do I check whether custom thumbnails are turned on? YouTube Studio (computer): Settings › Channel › Feature eligibility *Features you can use show “Enabled”. Path from YouTube Help's feature eligibility page.* Sign in to YouTube Studio on a computer, click Settings, then Channel, then Feature eligibility. Features you can use show “Enabled”. If intermediate features aren't enabled, verify your phone number from there or at youtube.com/verify, then come back to this screen. ### Other reasons the upload is blocked - You've hit the daily limit. If YouTube shows “Daily custom thumbnail limit reached”, its help page says to try again in 24 hours. Limits vary by country or region and by channel history. - Your channel has strikes. YouTube says copyright strikes may affect eligibility and Community Guidelines strikes reduce how many thumbnails you can upload. - You lost the feature for a policy reason. Repeat thumbnail violations can remove custom thumbnail privileges for 30 days. - You're trying to add a Shorts thumbnail on your phone. That's only possible in YouTube Studio on a computer. - The file is too big for the device. Over 2 MB fails on mobile; switch to a computer or shrink the file. **Why won't YouTube take your thumbnail?** - There's no Upload file option → Verify your phone number, then check Settings, Channel, Feature eligibility. - “Daily custom thumbnail limit reached” → Wait 24 hours and try again. - The upload fails on your phone → Keep the file under 2 MB, or upload from a computer (up to 50 MB). - It's a Short and you're on mobile → Use YouTube Studio on a computer. Shorts thumbnails can't be added on mobile. *The four most common reasons, from YouTube Help.* ## How do I add a custom thumbnail to a YouTube video? You can do it in YouTube Studio on a computer, in the YouTube Studio app, or in the main YouTube app. These steps are from YouTube's thumbnail help page. ### On a computer 1. **Open YouTube Studio**: Sign in to YouTube Studio. 2. **Go to Content**: Select Content in the left menu, then find the video and click its edit control. 3. **Upload the image**: Below Thumbnail, click Upload file and choose your image. Get suggestions offers generated options instead. 4. **Save**: Click Save. YouTube says changes may take some time to show up. 1. Sign in to YouTube Studio 2. Select Content 3. Open the video's edit view 4. Under Thumbnail, click Upload file 5. Click Save *Adding a thumbnail in YouTube Studio on a computer.* ### In the YouTube Studio app YouTube Studio app: Content › Your video › Edit › Edit thumbnail › Custom thumbnail *Then tap Select and Save. From YouTube Help's Android instructions.* Open the YouTube Studio app and tap Content in the bottom menu. Select the video, tap Edit, then Edit thumbnail. Pick one of the auto-generated frames or tap Custom thumbnail to choose an image from your phone, confirm with Select, then tap Save. Remember the 2 MB limit here. ### In the YouTube app Tap your profile picture, then Your videos. Next to the video, tap More, then Edit, then Edit thumbnail. Choose an auto-generated frame or Custom thumbnail, tap Select, then Save. ### Can YouTube suggest a thumbnail for me? Yes. Next to Upload file on a computer there's Get suggestions, and YouTube's help page also describes asking for thumbnails in Ask Studio during publishing: you type a request such as “Create a thumbnail”, add the video or reference images with Add in the chat box, then refine the result with follow-up requests like making the text larger. Treat suggestions as drafts. Run them through the same shrink test as your own designs, and check they show something that's really in the video, since the misleading-thumbnail rule applies whoever made the image. > Uploading a thumbnail before the video goes public is the safest habit. If you schedule uploads, set the thumbnail at the same time so the video never appears with an auto-picked frame. ## What size is a YouTube Shorts thumbnail? 2160 × 3840 pixels, which is 9:16, with a minimum height of 640 pixels. YouTube's page says Shorts thumbnails can currently only be added in YouTube Studio on a computer, and they need a verified account like regular thumbnails. In Studio, select Content, then the Shorts tab at the top, open the Short's edit view, click Upload file under Thumbnail, and save. There's a second Shorts detail people miss. If you upload a vertical video with a 16:9 custom thumbnail, YouTube shows an auto-generated 4:5 thumbnail on the home, explore and subscription pages instead. Your custom thumbnail still appears on the watch feed, in watch history and on non-mobile platforms. So if you want control over how a vertical video looks in those feeds, give it a 9:16 thumbnail rather than a horizontal one. **Video thumbnail** - 3840 × 2160 recommended - At least 640 px wide - 16:9 - Upload on computer or phone **Shorts thumbnail** - 2160 × 3840 recommended - At least 640 px high - 9:16 - Computer only, in YouTube Studio **Podcast playlist** - Square, 1:1 - Up to 10 MB on mobile - Up to 50 MB on desktop *Three thumbnail shapes YouTube lists on its help page.* If you're making a vertical version of a longer video, [how to clip a YouTube video](/blog/how-to-clip-a-youtube-video) covers cutting the clip, and the [Instagram Reel size guide](/blog/instagram-reel-size) has the 9:16 numbers for posting the same clip elsewhere. ## How do I design a thumbnail that works at small sizes? Design at 3840 × 2160, but judge the design at the size people will actually see it, which on a phone is a small fraction of your canvas. What reads at full size on a monitor can turn into noise once it's shrunk. These habits keep a thumbnail readable. They're design advice, not YouTube rules. ### Start with one subject Pick the single thing the video is about: a face reacting, the finished product, the before-and-after, the place. Make it large, ideally filling a third or more of the frame. Three small subjects become three smudges at thumbnail size. If you need to show a comparison, use two subjects with a clear split rather than a collage. ### Keep text short and away from the edges If you add words, use few of them and make them large, in a thick, simple typeface. A few words that add something the title doesn't say work better than repeating the title. Keep text and faces inside the middle of the frame with some margin at every edge, so nothing important sits where a crop or a corner could clip it. There's no YouTube-published safe zone for thumbnails, so use generous margins and check the result small. ### Use contrast you can see without color Text needs strong contrast against what's behind it: light on dark or dark on light, often with an outline or a solid panel behind it. A quick check is to view the thumbnail in grayscale. If the subject and the text still separate from the background, the contrast is doing its job. Busy backgrounds are the most common reason text disappears, so blur, darken or simplify the area behind words. ### Match the title, and don't promise what isn't there Read the thumbnail and title together. They should describe the same video, with the thumbnail showing and the title telling. Beyond being good practice, this is policy: YouTube's [thumbnail policy](https://support.google.com/youtube/answer/9229980) prohibits a thumbnail that misleads viewers to think they're about to view something that's not in the video. The [YouTube title checker](/tools/youtube-title-checker) helps you keep the title within its 100-character limit while you work on both. ### Keep a consistent look across a series Using the same layout, typeface and color for a series helps returning viewers spot your videos in a crowded feed. Save a template at 3840 × 2160 with your text styles and margins set, and swap in the new subject each time. ## How do I test a thumbnail before I publish? Test in two stages: a quick check yourself before upload, then a real test with viewers once the video is live. ### The shrink test 1. Export the thumbnail and open it on your phone, not just your computer. 2. Zoom out until it's about the size of a thumbnail in a phone feed, or view it from arm's length. 3. Ask what the video is about using only the image. If you can't tell in a second or two, simplify. 4. Check that any text is readable at that size. If you have to squint, use fewer, bigger words. 5. Put it next to a few thumbnails from videos on the same topic and see whether yours stands out or blends in. 6. Look at it in grayscale to check the contrast. ### Read your impressions click-through rate Once a video is live, YouTube Analytics shows how its thumbnail and title are doing through impressions click-through rate. YouTube's [impressions page](https://support.google.com/youtube/answer/7628154) defines it as how often viewers watched a video after seeing a registered impression on YouTube. Two details matter when you read it. Not every time someone sees your thumbnail counts as an impression, and impressions on external websites or end screens aren't included in this metric. So the rate describes how your thumbnail performs on YouTube's own surfaces, such as home, search and suggested videos. Compare a video's click-through rate with your other videos rather than with someone else's channel, and compare videos that got their impressions from similar places. A video shown mostly to subscribers often has a different rate from one shown mostly to new viewers in search, even with the same quality of thumbnail. If you change a thumbnail to fix a low rate, note the date so you can compare the days before and after. ### Can I change a thumbnail after the video is published? Yes, as often as you like within the daily limit. Use the same steps as for a new upload: Content, the video's edit view, then Upload file under Thumbnail and Save. The new image can take some time to replace the old one everywhere. Two cautions: if the video is in a Test & compare experiment, changing the thumbnail stops the test, and each change counts toward the daily custom thumbnail limit. ### Test & compare in YouTube Studio YouTube has a built-in A/B test called Test & compare. According to its [help page](https://support.google.com/youtube/answer/13861714), you can test up to 3 titles, thumbnails or both on a video. It's desktop only, through YouTube Studio, and you need advanced features turned on. When you upload or edit a video, click A/B Testing in the Title box or under Thumbnail, choose what to test, upload your versions and click Done. - Day 0: Upload up to 3 thumbnails or titles and start the test - During the test: Viewers see different versions; a small control group sees only the default - A few days to 2 weeks: The test finishes, depending on impressions and the video's age - Result: The version with the highest watch time share is shown to everyone *How YouTube's Test & compare runs, from YouTube Help.* YouTube picks the winner by watch time share, not click-through rate. A result can be Winner, Performed Same or Inconclusive; when there's no clear winner, the first version you uploaded becomes the default. Changing the title or thumbnail during the test stops it. To check progress, open the video's Analytics, go to the Reach tab, and under “How your A/B test is going” click Manage test. Some videos can't be tested: Shorts, scheduled live streams and Premieres (until a Premiere ends and becomes a regular video), and videos that are made for kids, for mature audiences or private. YouTube suggests testing older videos first and using clearly different versions, because near-identical options rarely produce a winner. ## What are YouTube's thumbnail rules? Thumbnails have to follow YouTube's Community Guidelines. The thumbnail policy says not to post a thumbnail that shows pornographic imagery, sexual acts or other sexually gratifying imagery, nudity, imagery depicting unwanted sexualization, violent imagery meant to shock or disgust, graphic imagery with blood or gore, vulgar or lewd language, or anything that misleads viewers about what's in the video. YouTube notes the list isn't complete. | What happens | When | | --- | --- | | A warning with no penalty | Usually the first time; it can expire after 90 days if you complete a policy training | | Thumbnail removed, possibly a strike | Most violations | | Video age-restricted or thumbnail removed, no strike | Thumbnails unsuitable for some audiences that don't break the guidelines | | Custom thumbnails removed for 30 days | Repeat offenses | | Channel may be terminated | Three strikes in 90 days, a channel dedicated to violating content, or pornography in a thumbnail | A strike triggers an email and an alert in your channel settings, and you can appeal. YouTube's thumbnail page says that if an appeal is approved and you haven't replaced the thumbnail, it may be restored. Separately, YouTube may turn off custom thumbnails for certain search results it considers inappropriate for viewers. ## Why is my YouTube thumbnail blurry, cropped or not showing? | What you see | Likely cause | What to do | | --- | --- | --- | | Blurry or soft thumbnail | Small source image scaled up, or heavy JPG compression | Start from a larger source, export at 1920 × 1080 or more, raise JPG quality | | Black bars or cut-off edges | The image isn't 16:9 | Crop to 16:9 yourself before uploading | | Old thumbnail still showing | Changes take time to appear | Wait, then check in a private window or on another device | | Vertical video shows a different image in feeds | 16:9 thumbnail on a vertical video gets an auto 4:5 version on home, explore and subscriptions | Use a 9:16 thumbnail for vertical videos | | “Daily custom thumbnail limit reached” | Too many uploads today | Try again after 24 hours | | Upload fails on your phone | File over 2 MB | Shrink the file or upload from a computer | | Thumbnail disappeared | Removed for a policy violation | Check email and channel settings for a strike, appeal if you disagree | | Thumbnails blurry in an A/B test | One version was below 1280 × 720 | Re-export every version at 1280 × 720 or larger | If you can't sign in to the channel at all to change anything, [how to recover a YouTube account](/blog/how-to-recover-a-youtube-account) walks through Google's recovery steps. ## How do I resize an image to the YouTube thumbnail size? Any image editor can do it, but the free [YouTube thumbnail resizer](/tools/youtube-thumbnail-resizer) does it in your browser without uploading the image anywhere. It crops and resizes to a YouTube thumbnail preset and downloads a file at exactly those dimensions. 1. **Pick a large source**: Use the largest, sharpest version of the image you have. Resizing down keeps detail; resizing up can't create it. 2. **Open the resizer and frame the crop**: Drop the image into the [thumbnail resizer](/tools/youtube-thumbnail-resizer) and move the crop so the subject sits where you want it. Nothing leaves your device. 3. **Download**: The tool saves a JPEG for photos, or a PNG if the image has transparency. 4. **Check the file size**: If the download is over 2 MB and you'll upload from a phone, or through a tool with a 2 MB cap, re-save it at a lower JPG quality or a smaller 16:9 size. 5. **Run the shrink test**: Look at it small on your phone before you upload it in YouTube Studio. Making artwork for the rest of your channel? The [YouTube banner size guide](/blog/youtube-banner-size) covers the 2560 × 1440 banner and its safe area, and [social media image sizes](/blog/social-media-image-sizes) lists every network's dimensions in one place. ## What should I check before I publish? **Thumbnail checklist** - [ ] 16:9 for videos, 9:16 for Shorts - [ ] 3840 × 2160 ideally, and never under 1280 × 720 if you'll A/B test - [ ] JPG or PNG, under 2 MB if uploading from a phone - [ ] Account verified, custom thumbnails Enabled - [ ] One clear subject, few large words, margins at every edge - [ ] Readable at phone-feed size and in grayscale - [ ] Matches the title and shows what's really in the video *Run through it once per video.* A thumbnail and a title work together, so finish both before the video goes live. The [YouTube title generator](/tools/youtube-title-generator) and [description generator](/tools/youtube-description-generator) can give you a starting draft, and the [tag generator](/tools/youtube-tag-generator) fills in tags. If you publish on a schedule, set the thumbnail when you schedule the upload, not after. [PostMesh can upload a video](/platform/youtube) with its title, tags and custom thumbnail through the YouTube API and schedule it up to 30 days ahead; the video uploads as private and YouTube makes it public at the time you pick. [How to schedule YouTube videos](/blog/how-to-schedule-youtube-videos) covers YouTube Studio's own scheduler too, and [the best time to post on YouTube](/blog/best-time-to-post-on-youtube) helps you pick the slot. Thumbnails also affect what a video earns, because more clicks from the same impressions means more views. If you're working toward monetization, [when YouTube starts paying you](/blog/when-does-youtube-start-paying-you) and [how much YouTube pays per 1,000 views](/blog/how-much-does-youtube-pay-per-1000-views) explain the numbers behind it. ## Questions ### Is 1280 × 720 still OK for a YouTube thumbnail? Yes, it uploads and looks fine on most screens, and it's the smallest size that keeps A/B tests at full quality. YouTube's current recommendation is 3840 × 2160. ### What is the YouTube thumbnail size in inches? Thumbnails are measured in pixels, not inches, so print size doesn't apply. Set your canvas to 3840 × 2160 pixels; the DPI setting doesn't change how it looks on YouTube. ### Can I use a GIF or WebP as a thumbnail? YouTube's help page names JPG and PNG as examples of formats to use. Convert other formats to JPG or PNG to be safe. ### Why don't I have the option to upload a custom thumbnail? Your account probably isn't verified. Custom thumbnails are an intermediate feature, which you get by verifying a phone number. ### Can I add a custom thumbnail to a Short on my phone? No. YouTube says Shorts thumbnails can only be added in YouTube Studio on a computer. ### How long does a new thumbnail take to show up? YouTube says changes may take some time to appear, without giving a number. Check again later in a private window or on another device. ### How many thumbnails can I test at once? Up to 3 with Test & compare in YouTube Studio on a computer. You need advanced features turned on, and the test usually finishes within two weeks. ### Can YouTube remove my thumbnail? Yes, if it breaks the Community Guidelines or the thumbnail policy. Most violations get the thumbnail removed and may bring a strike; repeat offenses can remove custom thumbnails for 30 days. ### Does the thumbnail size change for TV or desktop? No. You upload one image and YouTube scales it for each screen. A 3840 × 2160 image gives it the most detail to work with on large displays. ## Sources - [YouTube Help: Add video thumbnails](https://support.google.com/youtube/answer/72431) - [YouTube Help: Access features on YouTube (feature eligibility)](https://support.google.com/youtube/answer/9890437) - [YouTube Help: Verify your YouTube account](https://support.google.com/youtube/answer/171664) - [YouTube Help: Test & compare thumbnails and titles](https://support.google.com/youtube/answer/13861714) - [YouTube Help: Impressions and click-through rate](https://support.google.com/youtube/answer/7628154) - [YouTube Help: Thumbnails policy](https://support.google.com/youtube/answer/9229980)