Muhammad Murtaza

I build and write for Convertly — a free suite of image, PDF, and document tools that runs entirely in the browser. My work sits where the tools meet the questions people actually ask: why a WebP came out larger than the JPEG it came from, whether an ICO needs six sizes, what happens to a contract’s layout when it becomes a PDF.

I am a developer first, which shapes how these guides get written. Every conversion described here is one I ran in the tool itself, on a real file, in a real browser, and measured before it was published. Where a page shows a table of file sizes, those are bytes from an actual export — not estimates, and not numbers copied from a format’s marketing page. When a conversion behaves unexpectedly (and several do), the guide says so instead of smoothing it over.

What I write about

Three areas, because they are the three that cause the most wasted time: image formats and compression (when a file should be PNG, JPEG, WebP, AVIF — and when it should stay exactly what it is), conversion workflows that run client-side (what your browser can and cannot do with a file without ever uploading it), and document handling (PDFs, Markdown, Word, and Excel files that have to become something else without losing their structure).

How these guides are produced

Each guide starts with the specific failure someone hit, not with a keyword. I work through the conversion end to end, record what the output actually measures, check the edge cases that the documentation for these formats glosses over, and only then write. Recommendations are never sponsored, never ranked by partnership, and never padded with tools that are not in the library. If a method has a downside — and most do — it is in the guide, close to the recommendation, where you can weigh it before you act.

The result should read like a colleague explaining what they found: what to do, what not to do, and the numbers behind both. If you disagree with a conclusion, or a measurement does not match what you see, the contact form reaches me directly — corrections are published, with the guide updated.