Free utility tools for developers and designers. Most tools handle one file, one string, at a time. FreeToolDev is built from the ground up to process dozens at once — no install, no signup, no upload to a server.
Everything runs client-side. Your files never touch a server.
Resize, convert, or compress dozens of images at once. PNG, JPG, and WebP supported.
Data · BatchUpload multiple CSV files and convert them all to JSON in one pass.
Encode · DecodeConvert between text and Base64. Process multi-line input as a batch.
ContentEnter titles, links, and dates — get a valid RSS 2.0 feed instantly.
SEOPaste a list of URLs and generate a ready-to-use sitemap.xml.
NetworkCheck IP, DNS records, and SSL expiry for a whole list of domains at once.
SEO · Auto-crawlEnter a URL — auto-generates sitemap.xml, rss.xml, and llms.txt, plus finds broken links.
Converting one file is easy enough to ask an AI to do. The time actually gets lost when you have to repeat that ten times, or a hundred. FreeToolDev exists to remove that repetition.
Uploading client images to a third-party server is a bigger risk than most people realize.
Browser support, compression, encoding cost — picking the right format for a batch job.
For one or two files, AI is faster. Past a dozen, the math changes completely.