Resizing Images for Social Media — the Exact Sizes and the Workflow

Platforms change dimensions occasionally but the set below has been stable long enough to build templates around. Note that all of these are pixel widths at standard density; the platforms serve them at those sizes on phones, where they are viewed most.

• Instagram feed — square 1080 × 1080 (1:1), portrait 1080 × 1350 (4:5, the one that wins feed space), landscape 1080 × 566. Stories and Reels covers: 1080 × 1920 (9:16). Profile photo: displays at 110 × 110 and is cropped to a circle.
• YouTube — thumbnail 1280 × 720 (16:9) with a hard 2 MB file limit; channel art 2560 × 1440 with a safe area of 1546 × 423 centred, because TV, desktop and mobile crop the same file differently.
• TikTok — video covers 1080 × 1920; photo posts render 1080 wide at up to 9:16.
• LinkedIn — profile photo 400 × 400 minimum (displays smaller, square-cropped to a circle), personal banner 1584 × 396, company logo 300 × 300, shared feed images best at 1200 × 627.
• X (Twitter) — profile 400 × 400, header 1500 × 500, in-stream photos display around 1200 wide; PNGs are converted to JPEG over 5 MB.
• Facebook — profile 170 × 170 minimum, cover 851 × 315 (desktop display), shared link images 1200 × 630, event covers 1920 × 1005.

Two things happen between your upload and your followers' feed. First, if the file is larger than the display size, the platform resamples it — usually with a plain bilinear filter, quickly, on a server handling millions of images. It is competent but not beautiful: fine text and hairline details turn grainy. Second, everything gets recompressed to JPEG (or WebP/AVIF on some surfaces) at whatever quality the platform picked. A photo uploaded at quality 70 has now been through two lossy generations, which is where the mush comes from.

The fix is to take both jobs away from the platform. Upload at the exact display width so there is nothing to resize, and upload a clean file at quality 90-92 so the platform's recompression is the only loss the image suffers. One generation of compression at a sane quality is visually nearly lossless; two at aggressive settings is exactly the degradation people blame on 'bad phone cameras'.

A third, sneakier step: most platform encoders use 4:2:0 chroma subsampling, which throws away colour resolution — invisible on photos, brutal on thin white text over a saturated background. If your image carries text, render it larger and bolder than feels right, or upload a PNG and accept the format dance.

Start from the largest, cleanest file you have — the original photo, not a screenshot of an earlier export. Each pass through a lossy format costs data permanently, so generations matter.

Open the image resizer, enter the target width for the platform, keep the aspect ratio locked, and let the height compute. If the platform needs an exact aspect ratio (Instagram's 4:5, YouTube's 16:9), crop to the ratio first rather than letting the resize distort the picture — distortion is unforgivable, cropping is just editing.

Export at quality 85-92, then check the file size before you forget platforms with hard ceilings (YouTube's 2 MB thumbnail limit is the classic trip-up). If you are over, drop the quality slider in small steps rather than shrinking the dimensions — a full-size image at quality 84 beats a shrunken one at 95.

Repeat the pass for every platform you post to. A 4:5 Instagram original is not a LinkedIn banner; trying to make one file serve all slots is how people end up with cropped-out logos. Keeping one master and exporting per-platform takes two minutes once templates are set.

LinkedIn, Instagram, X and almost every avatar surface mask profile photos to a circle. The upload preview shows the full square; the published version has had its corners removed, including whatever you put in them. Before uploading, run the image through the circle-crop tool: it shows exactly what survives the mask and what does not. If a face fills less than two-thirds of the frame height, it will read as a dot at 110 px — zoom the crop until the subject fills the circle.

The same logic in reverse applies to rounded-corner cards and app icons: the rounded-corners tool previews the radius most platforms apply, and the resizer gets you to the exact 400 × 400 or 300 × 300 the upload forms ask for.

Some slots punish file weight directly — the 2 MB YouTube thumbnail, email-hostile banners, comment avatars. The image compressor solves these without a resize: it holds visual quality and hunts for the byte target. For thumbnails specifically, note that photographic content compresses far easier than flat vector-style graphics with text, which is why a movie-poster thumbnail can hit 150 KB while a bold-typography one strains at 500 KB. If you are fighting the ceiling, the answer is usually fewer sharp edges in the design, not a worse encoder.

Vertical full-screen surfaces (Stories, Reels, TikTok) are the one place where upscaling matters: a 4:5 photo dropped into a 9:16 frame needs padding or a blurred-fill background, not a stretch. The safe pattern is to resize the photo to 1080 wide, place it on a 1080 × 1920 canvas, and keep the top and bottom fifteen percent clear of anything important — that is where the platform's own text and buttons land. Blur the photo once more and drop it behind the sharp copy as a background fill; one pass through the blur tool makes the filler and the subject in a single file.