About This Site
LittleOne Tools is a free online toolbox for general-purpose users. We run 200+ browser-side utilities — no accounts, no install, open and use. Aside from a few explicitly disclosed third-party calls (such as Have I Been Pwned for password breach checks), your inputs and outputs do not leave your browser.
Calculators Frequent calculators, unit conversion, and production math 61 tools PDF & Print Prep PDF page organization, conversion, and print preparation 24 tools Images & Digital Art Image processing, creator asset prep, and code graphics 34 tools Text & Writing Text cleanup, writing support, preview, and comparison 27 tools Privacy & Security Local cleanup, inspection, and share-safe preparation helpers 24 tools Developer & Data Structured data, parsing, encoding, and developer utilities 56 tools
🔥 Popular Tools
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PDF Page Organizer
Reorder, remove, rotate, duplicate, and insert blank pages inside one PDF, then export a new document.
Text Line Filter
Multi-line text cleanup workbench for filtering lines, deduping, trimming, normalizing CRLF/LF/CR line breaks, joining lines, and adding or removing line numbers. Supports duplicate reports, delimiters and wrapping, number formats, copy, download, and summary copy; all processing stays in the browser with a 5 MB input limit.
Case Converter
Local workbench for text case conversion, title case, and URL slug generation.
Image Quick Edit Workbench
Combine rotate/flip, rounded corners/circle cutouts, and grayscale/black-and-white/sepia/threshold filters in one browser-local single-image quick edit workbench while existing single-purpose pages stay stable.
Word Counter
Writing analytics workbench for word counts, reading time, keyword density, and frequency distribution
JSON Formatter
Format, minify, and validate JSON with samples, stats, download, and TypeScript, Go, Java, Python, and C# code generation.
Date & Time Workbench
Calculate date differences, elapsed spans, date offsets, weekend-only business-day shifts, and lookup ISO week, quarter, leap year, browser timezone, lunar, zodiac, and approximate solar-term details.
PDF to Word
Extract readable text from text-based PDFs and generate a best-effort editable DOCX draft.
Image Compressor
Batch compress JPG, PNG, and WebP images by target percentage, file size, or quality preset for uploads, web assets, and sharing.
Markdown Editor Exporter
Local Markdown workspace with live preview, quick preview, and MD/HTML export.
Change Background of Photo
Extract the subject from one photo locally, place it on a simple solid or gradient background, and export a new PNG or JPG copy.
cURL Command Parser
Local HTTP request debug workbench for parsing cURL, raw headers, and User-Agent strings.
How We Work
- Local computation by default. Aside from a few explicitly disclosed third-party calls, tool inputs and outputs are not uploaded by our tools.
- Honest framing. We do not overstate tool capabilities, fabricate credentials, or make "absolute" promises; if our copy ever drifts from the code reality, we update it.
- Sensitive tools have limits. Finance and health tools are educational estimates, not professional advice.
See About for the full set of principles and update cadence.
Tool Boundaries
The site includes calculators and self-checks for finance (loans, tax, investment, savings, refinance, etc. — 12 tools) and health (BMI, BMR, body-fat, TDEE, ovulation, due-date, color-vision — 7 tools). They are educational, formula-based estimates and do not replace a licensed professional's judgment. See the finance-specific and health-specific sections of the disclaimer.