Shrink a file free, then run the 14-day binary on your own data. The number in your report comes from your files.
Your files, up to 6× smaller. Guaranteed identical.
ElaraShrink shrinks a PowerPoint, a log, a scan or a code folder far smaller than Windows ZIP, never larger than Brotli or zstd and smaller than both on structured data, and refuses to write the file unless it can prove it comes back byte-for-byte. Zero network calls. Right-click, done.
How big is the win?
Measured on real files, Windows 11. Every file came back byte-identical by SHA-256.
| File | Original | Windows ZIP | ElaraShrink | Smaller than ZIP |
|---|---|---|---|---|
| PowerPoint deck (.pptx) | 4.7 MB | 2.95 MB | 494 KB | 5.97× |
| Code folder (.tar) | 901 KB | 5 KB | 743 B | 6.77× |
| Uncompressed photo (.bmp) | 3.2 MB | 2.15 MB | 580 KB | 3.71× |
| Outlook email (.msg) | 548 KB | 511 KB | 248 KB | 2.06× |
| Server log (.log) | 2.5 MB | 332 KB | 166 KB | 2.00× |
| Already-compressed MP4 | 2.65 MB | 2.59 MB | 2.55 MB | 1.02×, a tie |
The contract we keep
For every file we write:
sha256(original) == sha256(decompress(compress(original)))
If the two do not match, we do not write the file. No flags. No "fast mode". No way to turn it off. The result is solved, not guessed.
Why people trust it
Why people trust it
It refuses to lie
Every operation prints a SHA-256 fingerprint of the original and the restored copy. They must match, or the smaller file does not get written.
It refuses to phone home
Zero network calls. No analytics, no accounts, no telemetry. Run Wireshark while it works, nothing leaves your machine.
It refuses to lock you in
Every line of source converts to free Apache-2.0 software after 24 months, automatically, irrevocably, no matter what.
The whole instruction manual
Right-click a file → "Compress with ElaraShrink". The smaller file appears next to the original. To restore: double-click it. That's it.
Store more. Prove it.
Shrink a file free, then run the 14-day binary on your own data. The number in your report comes from your files.