Formatters, converters & code utilities. Browse all 30 free tools below — every one runs instantly in your browser.
Beyond these free tools, our team builds custom websites and web apps — from landing pages to full-stack products.
30 tools · updated regularly
Payroll, EMI, interest & financial calculators
Campaign, UTM, ROAS & ad-copy tools
Convert CSV, Excel, XML & JSON files
Compress, convert, crop & edit images
Merge, split, compress & edit PDFs
Quotes, pricing, commission & CRM calculators
Meta tags, sitemaps, schema & keyword tools
Grading, planning & classroom generators
Crazy Tools' Developer Tools give you 30 free online tools for formatters, converters & code utilities — no signup, no watermarks, and no time limits. Every tool on this page opens instantly and works on desktop or mobile, so you can get the result you need and move on with your day.
Looking for something outside this category? Browse the full All Tools directory or head back to the Crazy Tools homepage.
Common questions about Developer Tools.
Yes — every tool in this category is 100% free to use, with no signup required and no limit on how many times you can use it.
No. All 30 tools in this category run directly in your browser — nothing to download or install.
Most tools process your input locally in your browser rather than uploading it to a server. See our Privacy Policy for full details.
Try the search box above, browse the All Tools directory, or let us know via Contact and we'll consider adding it.