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Tools

Word CounterReadability CheckerKeyword DensityWriting Pattern IndicatorLong-Tail Keyword IdeasSERP Snippet PreviewMeta Tag GeneratorURL Slug GeneratorRobots.txt GeneratorCore Web Vitals CheckerImage CompressorHTML MinifierCSS MinifierJavaScript MinifierVideo & Image SpecsQR Code GeneratorMerge PDFSplit PDFRotate PDFDelete PDF PagesRearrange PDF PagesExtract PDF PagesCrop PDFJPG to PDFPNG to PDFPDF to JPGPDF to PNGResize ImageCrop ImageImage ConverterWebP to JPGHEIC to JPGProfile Photo MakerImage to Text (OCR)MOV to MP4MKV to MP4WebM to MP4AVI to MP4MP4 to MP3Extract Audio from VideoTrim VideoMute VideoVideo to GIFResize VideoCompress VideoM4A to MP3WAV to MP3OGG to MP3AAC to MP3Split CSVSplit ExcelCSV to ExcelExcel to CSVExcel to XMLXML to ExcelXML to CSVXML to JSONJSON to CSV

How our tools work

Where your data goes, where our numbers come from, and how we test.

Where your data goes

57 of our 58 tools run entirely in your web browser using JavaScript. Text, code and images you enter are processed on your own device and never sent to our servers. You can confirm this by opening your browser’s developer tools and watching the Network tab while you use a tool.

The Core Web Vitals checker is the exception: to measure a page, Google’s PageSpeed Insights service has to load it. We send only the public URL you enter to Google, through our own server so you don’t need an API key. We don’t store it.

Where the numbers come from

  • Readability uses the published Flesch Reading Ease and Flesch–Kincaid Grade Level formulas.
  • SERP preview estimates pixel width using the fonts and sizes Google uses on desktop results.
  • Core Web Vitals comes directly from Google PageSpeed Insights (Lighthouse lab data).
  • Specs checker limits are compiled from each platform’s public help pages and dated so you know when they were last checked.
  • Keyword ideas are pattern-based suggestions, not search-volume data, and the tool says so.

How we test

Before a tool is published, we run it with realistic inputs and edge cases: empty input, very long text, unusual characters, and files that are too big or the wrong type. Minifier output is executed to confirm it still works, and generated QR codes are scanned to confirm they decode correctly.

When a tool doesn’t meet the bar

We remove it. Our former plagiarism checker depended on a web-search service that is no longer available to new projects, so rather than leave a broken tool online, we retired it.