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.
Image · BatchStrip editor bloat, comments, and excess coordinate precision from a whole batch of SVGs.
PDF · BatchCombine multiple PDFs into one, with an optional lossless or aggressive compression pass.
Data · BatchUpload multiple CSV files and convert them all to JSON in one pass.
Data · ConvertConvert JSON to YAML or back, including multi-document YAML files.
Data · ConvertConvert between comma and tab-delimited files with proper quote handling.
Data · BatchValidate and pretty-print several JSON snippets at once — no file upload needed.
Data · BatchValidate several documents against one schema in a single pass. Free, no per-document limit.
Encode · DecodeConvert between text and Base64. Process multi-line input as a batch.
Encode · DecodePercent-encode or decode a whole list of URLs or query strings at once.
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.
SEO · BatchPaste several sitemap.xml files at once and validate each against the Sitemap Protocol.
SEOGenerate a valid robots.txt in seconds, with one-click AI crawler blocking.
SEO · AITurn a list of your pages into a structured llms.txt file AI models can read.
SEOList your team and tech stack — generate a valid humans.txt file. No email or signup.
SEO · BatchPaste several page titles and descriptions at once and check every one's length. No URL fetch.
SEO · BatchPreview social share cards for several pages at once. No URL fetch — works on localhost.
SEO · BatchGenerate a unique social share image for every title in a list. Download as a ZIP.
SEO · BatchPaste several pages' HTML at once and check H1-H6 hierarchy for each.
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.
Encode · Decode · BatchDecode multiple JWTs at once — header, payload, and expiry status for each.
Batch · No-uploadGenerate QR codes for a whole list of URLs or text at once, no upload required.
Batch · No-uploadGenerate UPC, EAN-13, or Code128 barcodes for a whole list of codes at once.
Text · BatchPaste several original/modified text pairs at once and see a line-by-line diff for each.
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.
A plain-language guide to iss, aud, sub, exp, and the custom claims that show up everywhere.
A step-by-step guide to finding broken links using a free browser-based crawler.
Most "RSS generator" tools scrape someone else's site. If it's your own site, that's the wrong tool.