Compress files
without the upload.
Drop any image, PDF, video, or audio file — or a whole batch at once. Everything compresses right in this tab on your device. Pick how many files run in parallel, set your size goal, and download. Nothing is uploaded anywhere.
Drop files or click to choose
Images, PDFs, video, audio · parallel batch compression
Built for the files people actually compress
Compress Images
JPG, PNG, WebP, AVIF — smart quality targeting with binary-search encoding for your exact size goal.
Compress PDFs
Fast in-browser pass that deduplicates objects and rewrites compressed streams.
Compress Video
VP9/VP8 transcoding in your browser with bitrate matched to your target size. Runs in parallel with other files.
Compress Audio
Opus encoding with quality presets. Shrink podcasts, music, and voice memos without audible loss at balanced settings.
No account. No storage. No waiting.
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1
Drop your files
Select one file or a whole batch. Images, PDFs, video, audio, and more are all supported.
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They compress in parallel
Choose how many files run at once (1–8). Each file is re-encoded locally in your browser using the compressor best suited to its type.
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Download when ready
Grab each compressed file individually. Nothing was ever uploaded — it all stayed on your device.
FAQ
Do you store my files?
No. Every file is compressed entirely in your browser. Nothing is uploaded, transmitted, or stored on any server.
Can I compress multiple files at once?
Yes. Drop as many files as you like and use the Parallel jobs slider to control how many compress simultaneously (1–8). A batch of ten images at 4 parallel jobs finishes in roughly three rounds instead of ten.
What file types are supported?
JPG, PNG, WebP, AVIF, PDF, MP4, WebM, MP3, M4A, WAV, and more. All compression runs locally in your browser.
Is it free?
Yes. ShrinkVault is supported by unobtrusive ads rather than accounts or subscriptions.
Why did my PDF only shrink a little?
The in-browser pass cleans up structure and duplicate data, which helps text-heavy PDFs. Scan-heavy PDFs made mostly of embedded photos shrink less because re-encoding those images requires capabilities not available purely in a browser.