A growing suite of free, fast and private browser-based tools for images, text, SEO and developers. No sign-up. No uploads. No limits. Your files never leave your device.
Five categories of tools — more being added regularly. All free, all private.
Live tools are ready to use right now. Coming soon tools are in development.
Most online tools upload your files to a server. SF Tools never does.
SF Tools is a personal project by Salmanul Farisy — a web developer and creator passionate about building useful, privacy-first tools for the open web. Every tool here runs entirely in your browser with zero server involvement.
Yes. Every tool on SF Tools is 100% free with no limits, no watermarks and no account required. There are no premium plans or hidden fees — ever.
No. All processing runs in your browser using JavaScript and browser APIs like Canvas and FileReader. Your files never touch any external server.
There is no enforced limit. You can process as many files as your browser and device memory can handle — typically hundreds of images at once.
Image Studio is our all-in-one super image tool combining converting to WebP, resizing, cropping, rotating, flipping, watermarking and applying filters — all in a single interface with batch processing and ZIP download.
Currently PNG and JPG/JPEG are accepted as input. Both the WebP Converter and Image Studio output WebP format. More input and output formats are coming with future updates.
Yes — text tools (word counter, case converter), developer tools (JSON formatter, Base64, color picker), SEO tools (meta tag generator, sitemap) and file tools (PDF merger) are all in development.
Yes. Since all processing is local in your browser, your images never leave your device. They cannot be accessed by any external server, person, or service.
SF Tools is built by Salmanul Farisy, a web developer and creator. Visit salmanulfarisy.com to see more of his work.
SF Tools is a browser-based tools platform covering images, text, development, SEO and files.
Convert PNG and JPG to WebP instantly in your browser. WebP images are 25–34% smaller than JPEG at the same quality — improving page load speed, Core Web Vitals and Google search rankings.
Drop hundreds of images at once and process them all in a single run. Download individually or as a ZIP archive. No server queue, no waiting — everything runs locally at your device's full speed.
Unlike most online image tools, SF Tools never uploads your files anywhere. All conversion, compression, resizing and analysis runs entirely in JavaScript inside your browser tab.
Format JSON, encode/decode Base64 and URLs, convert colour formats, generate Lorem Ipsum, count words and convert text case — utilities built for developers and content creators.
Generate meta tags and Open Graph markup, check keyword density, create XML sitemaps, build robots.txt files, merge and split PDFs — tools designed to help you rank better and work faster.
Every tool on SF Tools is completely free with no sign-up, no watermarks, no daily limits and no premium tier. SF Tools is built to be genuinely useful without paywalls or restrictions.