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About Programmer Corner

Programmer Corner is a set of free online tools for the small, repetitive jobs that come up in everyday development work: converting an image, checking why a page is slow, auditing a page's SEO, formatting a blob of JSON, testing an API call or finding out when a site goes down.

Why this site exists

Most "free" online utilities make you pay in other ways. They ask you to create an account before you can download a result, stamp a watermark on your files, limit you to one conversion a day, or bury the actual tool under pop-ups. Programmer Corner started as one developer's answer to that frustration: build the tools properly once, keep them fast, and let anyone use them without signing up.

Every tool on the site is designed around three rules:

  • No sign-up for the core features. You open the page and use the tool. The only exception is the Uptime Monitor, which needs an account because it keeps running checks for you after you close the page.
  • No watermarks and no artificial limits. What you convert, format or generate is yours, exactly as you asked for it.
  • Respect for your data. Where a job can be done inside your browser, it is. Where a file or URL has to be sent to our server, it is processed and then discarded rather than kept. The Privacy Policy explains the details for each tool.

What you can do here

  • Image Converter — convert between JPG, PNG, GIF, WebP, AVIF and SVG, with adjustable compression and batch conversion.
  • Performance & Front-End Scanner — grade a page's DOM, CSS, JavaScript, page weight and common bad practices, with concrete fixes.
  • SEO Checker — audit meta tags, heading structure, links, sitemap and crawlability for any page.
  • Dev Tools — JSON, XML, HTML, CSS, JS and SQL formatters, JSON-to-code converters, Base64 and URL encoding, a JWT decoder, hash and UUID generators and more.
  • API Tools — convert cURL commands to C#, JavaScript or Python, build and test HTTP requests, look up status codes and inspect headers.
  • Uptime Monitor Bot — check your site on a schedule with a real browser and get a Telegram alert when it goes down.
  • IQ Test — a free 50-question reasoning test with an instant estimated score, available in nine languages.
  • Developer Skill Tests — adaptive tests for programming languages and frameworks that get harder as you answer correctly.

How the site is paid for

Running servers, domains and scanning infrastructure costs money. To keep every tool free, Programmer Corner may show advertising served by Google AdSense. Ads are kept separate from the tools themselves and never change the results you get. You can read how advertising uses cookies in our Privacy Policy.

Accuracy and feedback

The tools are built and tested carefully, but automated checks have limits: a performance score depends on the network at the moment of the test, and an SEO audit can only check what a page exposes publicly. Treat the results as a well-informed starting point rather than a final verdict.

If a tool gives you a wrong result, fails on a file, or is missing a feature you need, please get in touch. Bug reports and suggestions directly shape what gets built next.