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2026-08-16T00:00:00.000ZImage Compression2 min read

Video Cover Compression: Compress Thumbnails for Bilibili, TikTok & YouTube

Bilibili, TikTok and YouTube reject covers over a size limit? Learn to compress video thumbnails online — shrink covers to a target KB while keeping them sharp.

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Video creators know the struggle: uploading to Bilibili, TikTok, or YouTube, and the thumbnail has a size limit — Bilibili caps covers at 5MB, other platforms have resolution rules too. Your carefully made cover gets rejected because it's too large. Video cover compression solves it — shrink the thumbnail to the required size while keeping it sharp.

Which platforms limit covers

  • Bilibili: has a cover size cap
  • TikTok: size and ratio requirements for covers
  • YouTube: recommended thumbnail dimensions
  • Video accounts / Kuaishou: their own cover specs

Covers get rejected usually because of oversized files or wrong dimensions — compress and adjust and you're good.

Compress video covers with PixelForge

Open the PixelForge Smart Compress Tool — browser-local, nothing uploaded.

Step 1: Upload your thumbnail image. Step 2: Pick a compression quality (70%-80% shrinks JPG/PNG covers a lot). Step 3: For exact size control, use the compress-to-target tool. Step 4: Download and upload — it passes the platform's limit.

Video cover tips

  1. Check platform requirements first — max size and recommended ratio
  2. Crop before compressing with the crop tool
  3. Keep text legible — cover titles must stay sharp after compression
  4. Batch process covers for multiple episodes at once

Related Tools

Smart Compress →Compress to Target →Format Convert →

FAQ

Does compressing a video cover make it blurry?

Not with a reasonable rate. Covers need to show titles and visuals clearly; 70%-80% quality is nearly invisible. Over-compressing blurs text, so control the rate.

How do I compress a cover to a specific size?

Use the [compress-to-target tool](https://img-tools.top/target-compress) — enter the target KB and it auto-adjusts to keep the cover within the limit.

What size should a Bilibili cover be?

Bilibili recommends a portrait ratio and has a size cap. Compress to the platform's requirement and check sharpness after.

JPG or PNG for covers?

JPG usually — smaller and uploads faster. Use PNG only if you need transparency; otherwise convert to [JPG](https://img-tools.top/convert) and compress.

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