Thumbnail Compressor
Compress video thumbnails for fast-loading pages.
- Free
- No sign-up
- Files stay on your device
or drop a file here
paste with Ctrl/⌘+V · Accepted: image/*
Files stay on your device — nothing is uploaded
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What does Thumbnail Compressor do?
Thumbnail Compressor makes Thumbnail files smaller without uploading them anywhere. Photos are re-encoded at the quality you choose, so they upload faster. The pixel size stays the same — use the Image Resizer first if a platform needs exact dimensions.
Phone photos usually shrink by 60–85%.
What you can use
One or more Thumbnail files — drag them onto the box or tap to choose.
How to use Thumbnail Compressor
- Step 1
Drop your file(s) on the upload box or tap to choose.
- Step 2
Pick Light, Medium or Heavy — or drag the quality slider for exact control. The label under it shows exactly what each setting does.
- Step 3
Compare the before and after sizes, then download the result (or all files at once).
Good to know
- The quality slider: Light (about 20% smaller, best quality), Medium (about 35%, balanced) and Heavy (about 50% or more, visibly softer). Higher numbers mean better quality and bigger files.
- Platforms re-compress uploads anyway; a sensible-size file at quality ~80 tends to look better after upload than a huge original.
- If a file can’t be made smaller, the tool tells you and keeps the original instead of making it worse.
Your privacy
Your file is opened and processed by your own browser — it is never uploaded. That also means big files use your device’s memory, so very large files can be slow on older phones.
Related tools
All File CompressorsFrequently asked questions
Is Thumbnail Compressor free?
Yes. Thumbnail Compressor is completely free, with no sign-up, no watermark and no daily limit.
Are my files uploaded to compress them?
No. Compression runs inside your browser, on your device. Nothing is uploaded, which is why it is safe for private photos and documents — and why big videos depend on your device’s speed.
How much smaller will my file get?
It depends on the file. Phone photos often shrink 50–80%, WAV audio 80–90% and image-heavy PDFs about half. Light aims for about 20% smaller, Medium about 35% and Heavy about 50%. Files that are already compressed (MP3s, ZIPs of JPGs) change little — if the result isn’t smaller, you get your original back.
Does it work on my phone?
Yes. It works in Chrome, Safari and other modern browsers on Android and iPhone — pick files from your gallery or Files app. Large videos and long PDFs are faster on a computer.