Offline · Private · Windows

Offline image compressor
files never leave your PC

No cloud, no upload, no account. Compress a whole folder on your PC while your internet is off — JPG, PNG, WebP, AVIF, all local.

Download for Windows Pick your format →
100% offline · No upload · Windows
57.8% jpg→jpg avg84.5% png→webp avgOffline mode
The promise

Your images
stay on your disk

Online compressors ask you to upload what you own. Compressy runs entirely on your PC — nothing is sent anywhere.

Drop any folder — Compressy finds images in subfolders and keeps your structure.
Works with the network off. Your files never leave the machine.
No signup, no subscription. Install once and compress forever.
Proof

Real offline savings

57.8%
jpg→jpg avg

2.4 MB → 1.0 MB

84.5%
png→webp avg

1.9 MB → 290 KB

92.4%
Peak savings

456 JPGs

Offline
mode

No upload · No account

Best format

Pick your output format

Keep the original or convert to WebP/AVIF for the smallest files — all offline.

FormatSizeBest for
JPGBaselinePhotos, universal
WebP25–35% smaller than JPGWeb delivery
AVIF30–50% smaller than JPGSmallest files
ConversionBeforeAfterSaved
JPG → JPG (quality 85)2.4 MB1.0 MB−58%
JPG → WebP2.4 MB700 KB−71%
PNG → WebP1.9 MB290 KB−84%

Compress to JPG for compatibility, export WebP/AVIF for delivery — both offline.

How it works

Compress, offline, in three steps.

Everything runs on your PC — no upload, no waiting.

01
Open folder

Drop the folder with your images.

02
Compress

Pick quality 75–85 and output format.

03
Save

Write the smaller files back, keep originals or overwrite.

Related

More offline ways to shrink

FAQ

Offline compressor — FAQ

01
Does Compressy really work offline?

Yes. The desktop app runs on your PC with the network off — all compression is local, nothing is uploaded, no account needed.

02
What formats can I compress offline?

JPG, PNG, WebP and AVIF. Keep the original format or convert to WebP/AVIF for the smallest files.

03
Can I batch a whole folder?

Yes. Drop any folder — Compressy finds images in subfolders, keeps your structure and writes results alongside.

04
Is there a file size limit?

No. Since processing is local, there is no upload limit — only your disk.

Offline · Private

Compress offline. Keep your files.

The offline image compressor for Windows.

Download for Windows Compress any image →
No upload · No account · Windows