Practical guides to compressing and converting files — formats, quality trade-offs, and how to make things smaller without losing what matters. Every tool we mention runs privately in your browser.
How FileShrinking compresses images, video and PDFs entirely in your browser using WebAssembly and Web Workers — and why that keeps your files private.
Most online compressors upload your files to a server. Here is what really happens to them, the real risks, and how to spot a tool that is actually private.
Container or codec? Learn the real difference between MP4, WebM, MOV and MKV, which codecs they hold, and which to pick for sharing, web or editing.
What's the real difference between lossy and lossless compression? When to use each, how quality and file size trade off, and which formats use which.
A definitive comparison of JPEG, PNG, WebP, and AVIF: how each compresses, transparency and animation support, browser support, and when to use which.
A practical guide to shrinking images while keeping them sharp: what quality really means, the right settings, resizing, formats, and mistakes to avoid.
High-res images, scanned pages, embedded fonts, and duplicate objects all bloat a PDF. Here is what causes a large PDF and how to fix each cause.
Practical settings to shrink video for 25 MB email limits, fast web embeds, and social uploads — resolution, CRF, H.264, and trimming, all in your browser.
AVIF and WebP with a JPEG fallback, when PNG still wins, the <picture> element, and how image weight drives Core Web Vitals in 2026.
WebP makes images roughly 25-35% smaller than JPEG with the same quality. Here's what it is, how it works, and when to use it (and when not to).
Shrink MP3, AAC, FLAC, and WAV files the smart way: pick the right bitrate for music vs speech, understand sample rate, and keep audio sounding clean.