Bulk file renamer online
Rename files from multiple folders in one continuous sequence, set leading zeros, reorder the preview, and download renamed copies in a ZIP.
Open tool BFOTKIT / TOOL DIRECTORY
Free Online Developer & Data Tools Kit
Choose a tool to convert files, prepare data, adjust PDFs, or check devices. Each tool page explains supported formats, available options, and how to save the result.
38 tools
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ESRI ASCII Grid and TomTom ASC to CSV
Convert ESRI grid cells to CSV rows with coordinates and values, or convert TomTom POI records to a CSV table.
Open toolOnline ruler in inches, cm, mm, and pixels
Calibrate a browser ruler to your screen, measure against its edges, and place multiple X/Y markers.
Open toolWebsite status checker
Check a URL response, HTTP status, redirects, response time, and selected security and SEO signals.
Open toolFree QR code generator
Create a static QR code for a link, Wi-Fi network, text, email, or contact and export it in common image formats.
Open toolSewing pattern PDF scale checker
Measure a pattern test square, calculate the print scaling percentage, and create a corrected PDF.
Open toolPDF to JPG converter
Turn PDF pages into JPG images, choose output quality, preview pages, and download the images together.
Open toolMerge PDF files
Combine PDF documents in your chosen order and download one merged file.
Open toolJPG to PDF converter
Combine and reorder JPG, JPEG, and PNG images into a PDF with page-size and orientation settings.
Open toolCompress PDF online
Create a smaller PDF copy, choose a compression level, and compare the result with the original.
Open toolPDF to Word converter
Extract selectable PDF text into a DOCX document; scanned PDFs require OCR.
Open toolCSV to Excel import fixer
Choose a delimiter and encoding, preview CSV columns, preserve text values such as IDs, and download XLSX.
Open toolDouble-sided PDF alignment fixer
Measure duplex print offset with a calibration sheet, shift the back pages, and save a corrected PDF.
Open toolChange PDF page size
Resize mixed PDF pages to A4, A3, Letter, Legal, or a custom size and orientation.
Open toolTrue-scale PDF tiler
Split a large PDF page or image across standard paper sheets with overlap and alignment marks.
Open toolOnline keyboard, mouse, microphone, and screen tester
Check keyboard rollover, mouse clicks and pointer rate, microphone input, and solid screen colors.
Open toolGlobal salary PPP calculator and recipe scaler
Compare country-level salary purchasing power, scale recipes, convert kitchen units, and estimate simplified tax.
Open toolPrivate JSON formatter and text cleanup tools
Format and validate JSON, sort keys, convert JSON to CSV, remove hidden text characters, and extract unique lines, emails, or URLs.
Open toolSocial media post formatter
Format Reddit Markdown tables, split X (Twitter) threads with weighted character counts, and prepare LinkedIn posts locally in your browser.
Open toolLinkedIn line break generator
Preview LinkedIn post spacing, test an optional experimental blank-line aid, and copy a browser-formatted draft.
Open toolX thread splitter
Split long text into numbered X posts using weighted character estimates in the browser.
Open toolPomodoro focus timer
Run a timed focus session with presets, optional ambient audio, a custom alarm, and local session history.
Open toolXML to Excel converter
Use this XML to Excel converter online to turn repeating XML records into spreadsheet rows, preview fields, and download an XLSX workbook in your browser.
Open toolJSON to Excel converter
Convert JSON to Excel online with a free browser-based converter. Preview records, flatten nested fields into columns, and download an XLSX workbook.
Open toolPDF to Excel converter
Extract selectable PDF text into an Excel workbook online. Group visible text into rows and columns, preview the result, and download XLSX.
Open toolXML to CSV converter
Convert XML to CSV online. Select a repeating record element, preview its fields and attributes as columns, and download UTF-8 CSV for spreadsheet or data imports.
Open toolJSON to CSV converter
Convert JSON arrays of records to CSV online. Flatten nested object fields into columns, preview the rows, and download UTF-8 CSV for spreadsheets or imports.
Open toolXML to JSON converter
Convert XML to JSON online with a free browser-based converter. Keep element names, repeated elements, attributes, and text, then download formatted JSON.
Open toolJSON to XML converter
Convert JSON to XML online with a free browser converter. Choose a root element, map objects and arrays to XML tags, and download the result.
Open toolCSV to JSON converter
Convert CSV to JSON online with BFOTKit. Choose a delimiter, use headers or generated field names, preview records, and download a JSON array in your browser.
Open toolExcel to JSON converter
Convert an XLSX spreadsheet to JSON online. Choose a worksheet, use its first row as field names, preview each record, and download a JSON array. XLS files are not supported.
Open toolExcel to XML converter
Convert an XLSX spreadsheet to XML online. Choose a worksheet, turn rows into XML records, set a root element, and download the structured document.
Open toolCSV to XML converter
Convert CSV to XML online. Choose a delimiter and header row, preview the records, set a root element, and download structured XML for another application.
Open toolSRT to Excel converter
Convert SRT subtitles to Excel online. Organize cue numbers, timestamps, and multiline captions in an XLSX spreadsheet with this free browser converter.
Open toolExcel to SRT converter
Convert Excel to SRT online with a free browser converter. Choose a worksheet, map timing and caption columns, and download an SRT subtitle file.
Open toolSRT to VTT converter
Convert SRT subtitles to WebVTT online. Keep cue order and caption text, change timestamps to VTT format, and download a .vtt file for compatible video players.
Open toolWord to PDF converter
Convert text from a DOCX file to a readable PDF online. Paragraphs and table text are included; images, exact formatting, and complex layouts are not preserved.
Open toolExcel to PDF converter
Convert an XLSX worksheet to PDF online. Choose a sheet, preview its paginated table, and download a PDF copy. Charts and complex spreadsheet formatting are not reproduced.
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