Guides
Every tool on Toolkit answers a question — which format? how small? how strong? is this safe? These guides answer the questions properly: practical, plain-English explainers written to be useful on their own, whether or not you ever touch the tools they pair with.
Why Toolkit runs entirely in your browser (and why that matters)
Most online converters upload your files to a server. Here's how in-browser processing works, why it's safer, its honest tradeoffs — and how to verify it yourself.
PNG, JPG, WebP or HEIC? How to choose an image format
What each format is actually for, where each one wins, and a simple decision guide for photos, screenshots, logos and web images.
How to compress images for the web without losing quality
Make images dramatically smaller without visible damage: right-sizing dimensions, picking quality settings, and knowing when to switch formats.
What your photos reveal: EXIF data, GPS and how to remove them
Photos can carry your location, device details and precise timestamps. What's really embedded in an image file — and how to strip it before sharing.
MP4, WebM or GIF? Picking the right video format
Three containers, three different jobs. Which format to use for messaging, websites, social posts — and when a “video” should really be a GIF (rarely).
How to extract audio from a video (and which format to pick)
Turn a lecture, interview or concert clip into an audio file — and choose sensibly between MP3, M4A and WAV for the job at hand.
How AI vocal removers actually work
Inside stem separation: how a neural network unmixes a finished song into vocals, drums, bass and instruments — and how to get the cleanest result.
What makes a password strong? Entropy, length and passphrases
Why length beats complexity, what entropy actually measures, and how four random words outclass P@ssw0rd-style tricks.
How to share a password or secret safely
Email and chat keep copies of everything, forever. What actually happens when you paste a secret into a message — and safer ways to hand one over.
JWTs explained: what's inside a token and how to debug it
A JSON Web Token is three Base64 parts with well-known fields inside. How to read one, what the claims mean, and the classic mistakes that make tokens dangerous.
JSON vs YAML vs CSV: choosing a data format
Three ways to write data down, three different sweet spots. Where each shines, where each bites, and how to convert between them cleanly.
Checksums: how to verify a downloaded file is genuine
That SHA-256 string next to a download link is a fingerprint. What checksums prove (and don't), and how to check one in seconds.
Unix timestamps and time zones, demystified
What 1752192000 means, why UTC is the anchor, how daylight saving breaks naive math, and how to convert between human time and machine time.