Free Image, PDF, Data & Developer Tools

Developer Tools

Data Converter converts data between JSON, CSV, YAML, SQL INSERT statements and XML, and reports the line and position of syntax errors.

• Base64 / URL / JWT – encode and decode Base64 and URLs, and inspect JWT headers and payloads.
• Cron Parser – read Unix, Spring, Quartz and AWS cron expressions and see the next run times.
• RegEx Tester – test a regular expression with highlighted matches and capture groups, and preview replacements.
• Hash Generator – create MD5, SHA-1, SHA-256, SHA-384, SHA-512 and HMAC values for text or a local file, and compare checksums.
• Password & UUID Generator – create random passwords and UUIDs (v4 and v7) with your browser's cryptographic random generator.
• Unix Timestamp Converter – convert Unix timestamps in seconds, milliseconds, microseconds or nanoseconds to dates in any time zone, and back.

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Number Validators

• DNI, NIE & NIF Validator – calculate and check the control letter of a Spanish DNI or NIE, and see the legal form of a company NIF.
• TC Kimlik No Validator – check or work out the two check digits of an 11-digit Turkish identity number.
• INN & SNILS Validator – check the check digits of a Russian ИНН and СНИЛС and calculate a СНИЛС check number.
• CPF and CNPJ Validator – check the check digits of a Brazilian CPF or CNPJ, including the alphanumeric CNPJ.
• IBAN Validator – check an IBAN's length, country format and check digits, and write it in groups of four.
• Codice Fiscale Calculator – calculate an Italian codice fiscale from name, date and place of birth, or decode one.

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Text Tools

Text editing

• Word & Character Counter – count words and characters in your text, using the browser's own text segmentation.
• Case Converter – convert names, or every key in a JSON document, between camelCase, snake_case, kebab-case and other styles.
• Text Diff – compare two versions of text or code line by line.
• Lorem Ipsum Generator – generate placeholder text in Latin, Korean, Japanese or Chinese.
• Slug Generator – turn titles into URL slugs and remove accents from Turkish, German and other Latin-script text.

Language & script converters

• Number to Words – write an amount in words for checks, invoices and contracts in 14 languages, from US checks to Chinese 大写.
• Full-Width ↔ Half-Width – convert full-width letters, digits and katakana to half width and back, and hiragana to katakana.
• Remove Vietnamese Accents – write Vietnamese without diacritics (Nguyen Van Duc), with đ as d, or remove only the tone marks.
• Korean Name Romanization – write a Korean name in Roman letters as on passports (Hong Gildong), with the spellings Korean passport holders use.
• Cyrillic to Latin – transliterate Russian into Latin letters by the ICAO passport table or BGN/PCGN.
• Simplified ↔ Traditional Chinese – convert Simplified Chinese to Traditional for Taiwan or Hong Kong, or back, word by word with OpenCC.

Speech & subtitles

• Audio to Text – transcribe an audio or video file with Whisper and save the text or SRT and VTT subtitles, without uploading it.

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Date Tools

• Japanese Era Converter – convert Western dates to Japanese era names (Reiwa, Heisei, Showa) and back, with exact era start dates and an age chart.
• Thai Buddhist Year Converter – convert dates between the Thai Buddhist Era (พ.ศ.) and the Western calendar, including January to March before 1941.
• Lunar Calendar Converter – convert lunar dates to Gregorian dates and back for the Korean, Chinese and Vietnamese calendars (1901–2050), with leap months and the zodiac year.

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Calculators

• Percentage Calculator – work out a percent of a number, percent change, and prices before or after a discount, with exact results.
• VAT Calculator – add VAT to a net price or take it out of a gross price, with checked rates for the UK and 15 more countries, several invoice lines and rounding options.
• Loan Calculator – monthly payment, total interest and a full amortization schedule for equal payments, equal principal, interest only or a flat rate.
• Compound Interest Calculator – growth of savings with regular deposits, any compounding frequency, APY and a year-by-year table.
• BMI Calculator – body mass index with the WHO/CDC classes or the national cut-offs of Korea, Japan, China, the UK, Indonesia and Thailand.
• Calorie Calculator – basal metabolic rate and daily calorie needs with Mifflin-St Jeor, Harris-Benedict, FAO/WHO/UNU, or Japan’s and Korea’s 2025 standards.
• Age Calculator – exact age in years, months and days on any date, days lived, the next birthday and Japan’s legal age day.
• Korean Age Calculator – work out international age (만 나이), year age and the traditional counting age, with the days to the next birthday and lunar birthdays.

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Image Tools

• Image Converter – convert PNG, JPG, WebP, GIF, BMP and AVIF images, one file at a time or as a batch downloaded in a ZIP file.
• Image Resizer – resize one or more images by pixels or percentage, keeping the aspect ratio.
• Image Compressor – make JPG, PNG and WebP files smaller with a quality setting or a target file size.
• Crop Image – crop an image freely or to a fixed aspect ratio.
• Rotate & Flip Image – rotate images by 90°, 180° or any angle, or mirror them.
• Remove EXIF Data – view and remove location, camera and other metadata from photos without re-compressing them.
• Image to Text (OCR) – extract text from photos, scans and screenshots.
• Favicon Generator – create favicon.ico, PNG icons, an Apple touch icon and a web app manifest.
• ID Photo Maker – make passport, visa and ID photos in sizes such as 35 × 45 mm or 2 × 2 in, with head guides and print sheets.
• QR & Barcode Generator – create QR codes and barcodes, including EAN and UPC formats.

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PDF Tools

• PDF to JPG – save each page as a JPG or PNG image.
• JPG to PDF – combine images into one PDF, in the order you choose.
• PDF to Text – extract the text layer, with OCR for scanned pages.
• Merge PDF – combine several PDF files into one document.
• Split PDF – extract single pages, ranges or every page.
• Compress PDF – shrink scanned and image-heavy PDFs.
• Organize PDF – reorder, rotate, delete, duplicate or insert pages.
• Rotate PDF – rotate all pages or only the pages you select.
• Add Watermark to PDF – add a text or image watermark to some or all pages.
• Add Page Numbers – number pages in the position and format you choose.

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Why Use LeedyBox?

• No installation or account: the tools run in a web browser.
• Each page focuses on one task, with the options that task needs.
• Files and text are processed in your browser instead of on a LeedyBox server.
• All current tools are free to use.

Helpful Guides

Practical explanations of image formats, resizing and compression, photo metadata, favicons, PDF workflows, OCR, data formats, regular expressions, cron schedules, Unix timestamps, hash functions, passwords and UUIDs, word counts and QR codes.

Related: Browse all guides · Image guides · PDF guides · Developer guides · Text guides · Date guides · Calculator guides

How LeedyBox Processes Files

Read how a file or text moves from selection to result and download, which open-source libraries and browser features each tool uses, and which browser limits can affect a result.

Related: Read How It Works

Frequently Asked Questions