Developer Tools
Developer tools for JSON, Base64, URL encoding, timestamps, UUIDs, hashes, CSV, and debugging tasks.
What you can do
Developer Tools brings together focused LumaTool utilities for browser-based creator, developer, and productivity workflows. Developer tools for JSON, Base64, URL encoding, timestamps, UUIDs, hashes, CSV, and debugging tasks. Use this collection when you want a clear starting point before choosing a specific tool, checking its privacy notes, and moving into a task-specific page. The directory introduction appears before filters and tool cards so users and search engines can understand the purpose of the collection before seeing navigation labels. Start from the job you need to complete, open the closest matching utility, review the result, and continue into related tools when your workflow needs cleanup, conversion, validation, or publishing preparation.
Popular tools
Base64 Encode / Decode
Encode and decode Base64 text with UTF-8, URL-safe, and Unicode support.
Use Now CCompress PDF
Apply best-effort local PDF compression with image quality, resolution, and grayscale controls plus honest before-and-after size reporting.
Use Now CCSV to Excel Converter
Parse CSV or TSV locally, preview rows and columns, choose a delimiter, and export a formatted XLSX workbook.
Use Now CCSV to JSON
Convert CSV rows to JSON arrays or objects locally.
Use Now EExcel to CSV Converter
Convert an Excel worksheet to CSV locally with sheet selection, delimiter, line-ending, preview, and row and column counts.
Use Now EExcel to JSON Converter
Convert an Excel worksheet to a JSON object array locally with sheet, header row, empty-value, and preview controls.
Use Now HHTML Escape / Unescape
Escape and unescape HTML entities for safe display and debugging.
Use Now IImage to PDF Converter
Reorder images and create a Letter, Legal, A4, or image-sized PDF with orientation, margin, fit, and background controls.
Use Now JJSON Formatter
Format, minify, validate, sort keys, escape, and unescape JSON locally.
Use Now JJSON to CSV
Convert JSON objects or arrays to CSV for spreadsheets and reports.
Use Now JJSON to Excel Converter
Recognize JSON arrays and objects, preview the resulting table, and export an XLSX workbook entirely in the browser.
Use Now JJWT Decoder
Decode JWT header and payload locally without sending tokens to a server.
Use Now MMerge PDF
Merge multiple PDFs locally, reorder files, choose page ranges, review file and page counts, and download one combined PDF.
Use Now OOrganize PDF
Preview, reorder, delete, rotate, duplicate, and extract PDF pages in your browser without uploading the document.
Use Now PPDF to Image Converter
Render selected PDF pages to PNG, JPG, or WebP locally with scale, quality, page-range, individual, and ZIP downloads.
Use Now RRegex Tester
Test JavaScript regular expressions and inspect matches, indexes, and groups.
Use Now SSign PDF Online
Draw, type, or upload a visible signature, position it on a PDF page, add a date and signer name, and download the signed document locally.
Use Now SSplit PDF
Split a PDF by ranges, every N pages, selected pages, or one file per page and download multiple outputs as a ZIP.
Use Now UUnix Timestamp Converter
Convert seconds, milliseconds, local time, UTC time, and ISO date strings.
Use Now UURL Encode / Decode
Encode, decode, parse, and build URL query parameters in batches.
Use Now UUUID Generator
Generate one or many UUID v4 values locally with browser crypto fallback.
Use NowFAQ
Are these LumaTool tools free?
Yes. Public LumaTool utilities are free to open and use without creating an account.
What workflows does this category support?
It supports focused browser tasks such as checking, converting, cleaning, generating, and preparing output for the next step.
Do these tools upload my input?
Most local tools process input in the browser. Pages that need network requests explain that behavior in their privacy notes.