About Convertify
Convertify is a free online image converter that handles HEIC, AVIF, WebP, PNG, JPG, TIFF, BMP, GIF and 20+ other formats. No signup required. No file size limits. Converted files are available for 6 hours, then permanently deleted.
Why I built it
Every image converter I tried either required creating an account, had arbitrary file size limits, or was slow. I wanted something fast, private, and with no unnecessary friction — so I built it myself.
The backend is written in Rust using libvips — one of the fastest image processing libraries available. libvips processes images using a demand-driven streaming pipeline that avoids loading the entire file into memory, making conversions fast even for large files. The frontend is built with Next.js and deployed as a fully static site with PageSpeed 100/100.
How it works
Privacy
Your files are processed server-side over an encrypted HTTPS connection. Converted files are available for download for 6 hours, then permanently deleted from the server. No account is required, and no personal data beyond what is necessary for conversion is collected. Convertify does not analyze, share, or use your image content for any purpose other than performing the conversion you requested.
About the author
I'm Serhii Kalyna, a full-stack developer based in Kyiv, Ukraine. I work primarily with Rust, TypeScript, PostgreSQL, and SvelteKit. Convertify is a solo project I built and maintain in my spare time.
I write about the technical decisions behind Convertify on dev.to — including the migration from a React SPA to Next.js SSG, why AVIF is the right format for web images in 2026, and how libvips compares to other image processing options.