File Size Reducer
Drop a file below and get a smaller copy in seconds. The reducer runs inside this page — nothing is uploaded, nothing is stored, and there is no size cap.
Drop files here to compress
JPEG, PNG, WebP, PDF, DOCX, PPTX, XLSX, MP3, WAV, FLAC
Quick Answer
It re-encodes a file with more efficient settings so it takes up less space while looking the same. FileSlim does this locally in your browser, so the file never travels to a server.
— What does a file size reducer do?
How much smaller will my file get?
| File type | Typical reduction | What changes |
|---|---|---|
| JPEG photo | 60–80% | Re-encoded at a visually matched quality level |
| PNG graphic | 20–40% | Lossless re-packing, pixels untouched |
| Scanned PDF | 70–90% | Embedded page images downsampled and recompressed |
| DOCX / PPTX | 40–70% | Oversized embedded media shrunk, layout preserved |
| MP3 / WAV | 50–80% | Re-encoded to Opus at a speech- or music-safe bitrate |
Reducing to a specific limit
Upload forms and ID portals that cap photos.
Government and university submission limits.
The most common email attachment ceiling.
Why reduce files on your own device
Nothing leaves your computer
No upload wait
Check before you keep it
Built for attachment limits
Questions about reducing files
How do I reduce a file size?
Drop the file into the reducer above and press Compress. FileSlim re-encodes images, PDFs and Office documents in your browser and hands back a smaller copy — usually 50–90% lighter — without uploading anything.
Does reducing file size lower quality?
Only as much as you allow. The Balanced setting keeps changes invisible at normal viewing size; Lossless mode reduces PNG and Office files with zero pixel change. You can preview the result before downloading.
Can I reduce a file to an exact size?
Yes. Use the target-size tools for common limits: 100 KB images, 200 KB PDFs and 1 MB PDFs. The reducer tries several settings and stops at the first one that fits.
Which files can this reducer shrink?
JPEG, PNG, WebP, AVIF and GIF images, PDF documents, DOCX, PPTX and XLSX Office files, plus MP3 and WAV audio.
Is there a size limit?
No. Because the work happens on your own device there is no upload cap — files over 1 GB have been reduced successfully. Speed depends on your CPU and memory.
Need a different job done?
Resize, convert, merge, split and rename files — all locally, all free.
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