Products that live on the open web

Image conversion that never uploads your files.

SwapFormat is a set of free image converters that run entirely inside the browser. Most online converters work by uploading your image to a server, converting it there, and handing back a download link — which means a copy of your file now lives on someone else's machine. SwapFormat does the conversion locally instead, so the image never leaves your device. There is no sign-up, no watermark, and no upload step to wait on.

An independent web product by Hemanth Kumar Guvvala

What it does

• check_circleConverts HEIC, WebP, AVIF, SVG, PNG and JPG
• check_circleRuns entirely in the browser — files are never uploaded
• check_circleBatch conversion for multiple images at once
• check_circleNo sign-up and no account required
• check_circleNo watermark on output files

Interview preparation with the depth the listicles skip.

Most Java interview resources give you a paragraph to memorise and stop there — which falls apart the moment an interviewer asks a follow-up. CodeDepth answers each question on three levels: the concise 45-second answer you would actually say out loud, the real mechanism underneath it, and the follow-up questions that typically come next. Every code example on the site is compiled and run as part of the build, so the snippets are verified rather than merely plausible.

An independent learning platform by Hemanth Kumar Guvvala

What it does

• check_circleEvery question answered at three depths: answer, mechanism, follow-ups
• check_circleCode examples compiled and executed on every build
• check_circleStructured Java topics rather than a flat question dump
• check_circleWritten for follow-up questions, not memorisation