Compress files = shrink files = reduce file size. In Swedish this is krymp filer / komprimera filer. Same tool — everything runs locally in your browser.
Compress files · free · in your browser
Compress files online — free, private, in your browser
Krymp is a free toolbox that shrinks images, PDFs, video and audio directly in your browser. Nothing is uploaded, nothing is watermarked, nothing needs an account. Typical savings: 40–80 %.
- In your browser
- No upload
- Free, no account
Pick a file type
- Compress imagesJPG, PNG, WebP, HEIC — typically 40–80 % smaller with no visible quality loss.JPG · PNG · WebP · HEIC
- Compress PDFShrink PDFs while keeping text sharp and searchable.PDF
- Compress videoCut MP4/MOV size for email, socials or WhatsApp.MP4 · MOV · WebM
- Compress audioShrink MP3, WAV and M4A without audible quality loss.MP3 · WAV · M4A
- Convert formatsChange format for smaller files (HEIC→JPG, WebP→JPG, PNG→WebP and more).All common
How to compress a file — 4 steps
- 1
Pick the right tool
Images → krymp.io/en/compress-image, PDF → krymp.io/en/compress/pdf, video → krymp.io/video, audio → krymp.io/ljud.
- 2
Drop the file
Drop or select the file. Krymp reads it locally in your browser — no upload.
- 3
Choose quality
Move the slider or set a target size (e.g. 1 MB). You see the new size instantly.
- 4
Download the smaller file
Save the optimised file to your device. Done.
FAQ
How do I compress a file online?
Open krymp.io, pick the tool that matches your file (image, PDF, video or audio), drop the file in, choose quality, and download the smaller file. Everything runs locally — nothing is uploaded.
Is it really free to compress files on Krymp?
Yes. All tools are free — no sign-up, no watermarks, no uploads. Krymp is funded by Hasty and usage is fully anonymous.
Is it safe to compress sensitive files?
Yes. Compression runs as WebAssembly directly in your browser. Your file never leaves your device — no server copies, no content logs. GDPR-friendly by design.
Which file types can I compress?
Images (JPG, PNG, WebP, HEIC, AVIF), PDFs, video (MP4, MOV, WebM) and audio (MP3, WAV, M4A). For archives use your OS' built-in ZIP.
How much smaller will my files get?
Typically 40–80 %. A 5 MB phone JPG usually ends up around 0.5–1 MB. A 20 MB image-heavy PDF usually drops below 5 MB. Video can halve at unchanged perceived quality.
Does it work on mobile?
Yes. Krymp is built mobile-first and works on iPhone, Android, iPad and every desktop browser. Batch size is limited by the device's memory.
What does 'krymp' mean?
'Krymp' is Swedish for 'shrink' or 'compress'. Krymp.io is the English-friendly product built on the same tool set our Swedish users rely on.
References & further reading
- Compression Streams APIMDN Web Docs
The web standard for compressing data directly in the browser.
- ISO 32000-2 — PDF 2.0ISO
The official specification that defines how PDF files are built.
- Data compressionWikipedia
Background on how lossy and lossless compression work.
- RFC 1951 — DEFLATEIETF
The algorithm behind ZIP, gzip and PDF streams.
- MozJPEGMozilla
The image encoder we use to shrink JPGs without visible quality loss.
Also available in svenska.