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★ LocalHost Run — Developer Tools

Browser-based JSON, text, image, PDF and more — a collection of practical tools. No install required — open and use.

◀ Categories

  • Image Tools
  • PDF Tools
  • Text Tools
  • Video Tools
  • Time Tools
  • Audio Tools
  • JSON Tools

Categories ▶

  • List Tools
  • CSV Tools
  • Number Tools
  • PNG Tools
  • XML Tools
  • GIF Tools
  • Converter Tools
Image ToolsPDF ToolsText ToolsVideo ToolsTime ToolsAudio ToolsJSON ToolsList ToolsCSV ToolsNumber ToolsPNG ToolsXML ToolsGIF ToolsConverter Tools

Image Tools

Tools for working with pictures – compress, resize, crop, convert to JPG, rotate, remove background and much more.


  • Image Editor — Edit images with advanced tools and features
  • Resize Image — Resize one or multiple images at once.
  • Compress Images — Compress one or multiple images at once.
  • Remove Background from Image — Automatically remove backgrounds from images
  • Crop Image — Crop images quickly.
  • Change image Opacity — Adjust transparency of images
  • Change colors in image — Quickly swap colors in a image
  • Create transparent PNG — Quickly make an image transparent
  • Image to Text (OCR) — Extract text from images using OCR.
  • QR Code Generator — Create customized QR codes for various data formats.
  • Rotate Image — Rotate an image easily.
  • Split Image into Pages — Split a large image into multiple pages (PDF).

PDF Tools

Tools for working with PDF files - extract text from PDFs, convert PDFs to other formats, manipulate PDFs, and much more.


  • Split PDF — Extract specific pages from a PDF file
  • Rotate PDF — Rotate pages in a PDF document
  • Compress PDF — Compress PDF files securely in your browser
  • Protect PDF — Password protect PDF files securely
  • Merge PDF — Merge multiple PDF files into a single document
  • PDF to EPUB — Convert PDF files to EPUB format
  • PDF to PNG — Convert PDF into PNG images
  • Images to PDF — Convert images to PDF with scale and orientation control
  • Extract Images from PDF — Extract images from a PDF file.

Text Tools

Tools for working with text – convert text to images, find and replace text, split text into fragments, join text lines, repeat text, and much more.


  • Split — Split text into multiple parts using a separator
  • Join Text — Join text elements with a specified separator
  • Remove duplicate lines — Quickly delete all repeated lines from text
  • String To morse — Quickly encode text to morse
  • Text Replacer — Quickly replace text in your content
  • Repeat Text — Repeat text multiple times
  • Truncate Text — Truncate text to a specified length
  • Reverse — Reverse any text character by character
  • Randomize case — Randomize the case of letters in text
  • Convert to Uppercase — Convert text to uppercase
  • Extract substring — Extract a portion of text between specified positions
  • Create palindrome — Create text that reads the same forward and backward
  • Palindrome — Check if text reads the same forward and backward
  • Text Quoter — Add quotes around text with various styles
  • Rotate Text — Shift characters in text by position.
  • ROT13 Encoder/Decoder — Encode or decode text using ROT13 cipher.
  • Base64 Encoder/Decoder — Encode or decode data using Base64.
  • Text Statistics — Get statistics about your text
  • Text Censor — Quickly mask bad words or replace them with alternative words.
  • Password Generator — Generate secure random passwords with custom options
  • String URL encoder — Quickly URL-escape a string.
  • String URL decoder — Quickly URL-unescape a string.
  • Unicode Encoder / Decoder — Encode or decode text using Unicode escape sequences.
  • Hidden Character Detector — Find hidden Unicode characters in text
  • Compare Texts — Compare two texts and spot differences instantly
  • Slug Generator — Generate URL-friendly slugs from text.

Video Tools

Tools for working with videos – extract frames from videos, create GIFs from videos, convert videos to different formats, and much more.


  • Trim Video — Trim video by removing unwanted sections
  • Rotate Video — Rotate video by specified degrees
  • Compress Video — Compress videos by scaling to different resolutions
  • Loop Video — Create looping video files
  • Flip Video — Flip video horizontally or vertically
  • Crop Video — Crop video to remove unwanted areas
  • Change Video Speed — Change video playback speed
  • Video to GIF — Convert video to animated GIF
  • Merge videos — Append and merge videos easily.
  • Add Audio to Video — Add or replace audio track in video

Time Tools

Tools for working with time and date – calculate time differences, convert between time zones, format dates, generate date sequences, and much more.


  • Convert Days to Hours — Convert days to hours
  • Convert Hours to Days — Convert hours to days
  • Convert Seconds to Time — Convert seconds to time format
  • Convert Time to Seconds — Convert time format to seconds
  • Truncate Clock Time — Truncate clock time to specified precision
  • Time Between Dates — Calculate time between two dates
  • Crontab Guru — Parse and explain cron expressions in plain English
  • Check Leap Years — Check if a year is a leap year
  • Convert Unix ↔ Date — Convert Unix timestamps and dates in both directions.
  • Convert time to decimal — Convert human time to decimal time
  • Discord Timestamp Generator — Generate Discord timestamps from dates

Audio Tools

Tools for working with audio – extract audio from video, adjusting audio speed, merging multiple audio files and much more.


  • Extract Audio from Video — Extract audio from video files (MP4, MOV, etc.) to AAC, MP3, or WAV.
  • Change audio speed — Change the speed of audio files
  • Trim Audio — Trim audio files to extract specific time segments with sub-second precision (MP3, AAC, WAV).
  • Merge Audio — Merge multiple audio files into one (MP3, AAC, WAV).

JSON Tools

Tools for working with JSON data structures – prettify and minify JSON objects, flatten JSON arrays, stringify JSON values, analyze data, and much more


  • Validate JSON — Validate JSON code for errors
  • Prettify JSON — Format and beautify JSON code
  • Minify JSON — Minify JSON by removing whitespace
  • Stringify JSON — Convert objects to JSON string
  • JSON to XML — Convert JSON to XML format
  • JSON to CSV — Convert JSON to CSV format
  • Escape JSON — Escape special characters in JSON
  • Compare JSON — Find differences between two JSON objects
  • Sort JSON — Sort JSON arrays by value or object keys alphabetically

List Tools

Tools for working with lists – sort, reverse, randomize lists, find unique and duplicate list items, change list item separators, and much more.


  • Sort — Sort list items in specified order
  • Unwrap — Unwrap list items from structured format
  • Reverse — Quickly reverse a list
  • Find unique — Find unique items in a list
  • Find most popular — Find most frequently occurring items
  • Chunk List — Split a list into fixed-size chunks
  • Wrap — Wrap list items with specified criteria
  • Rotate — Rotate list items by specified positions
  • Shuffle — Randomize the order of list items
  • Truncate — Truncate list to specified number of items
  • Duplicate — Duplicate list items with specified criteria

CSV Tools

Tools for working with CSV files - convert CSV to different formats, manipulate CSV data, validate CSV structure, and process CSV files efficiently.


  • Convert CSV to JSON — Convert CSV data to JSON format.
  • Convert CSV to XML — Convert CSV data to XML format.
  • Convert CSV Rows to Columns — Convert CSV rows to columns.
  • Convert CSV to TSV — Convert CSV data to TSV format.
  • Swap CSV Columns — Reorder CSV columns.
  • Convert CSV to YAML — Quickly convert a CSV file to a YAML file.
  • Change CSV Separator — Change CSV file delimiter
  • Find incomplete CSV records — Quickly find rows and columns in CSV that are missing values.
  • Transpose CSV — Quickly transpose a CSV file.
  • Insert CSV columns — Quickly insert one or more new columns anywhere in a CSV file.
  • TSV to JSON — Convert TSV to JSON format

Number Tools

Tools for working with numbers – generate number sequences, convert numbers to words and words to numbers, sort, round, factor numbers, and much more.


  • Sum — Calculate sum of numbers
  • Generate — Generate random numbers in specified ranges
  • Arithmetic Sequence — Generate arithmetic sequences
  • Random Port Generator — Generate random network ports
  • Random Number Generator — Generate random numbers in custom ranges
  • Radix Converter — Convert between binary, octal, decimal, and hex
  • Byte Converter — Quickly convert values between byte units
  • Ohm's Law — Calculate voltage, current, or resistance in electrical circuits using Ohm's Law
  • Round trip voltage drop in cable — Calculate voltage drop and power loss in electrical cables based on length, material, and current
  • Area of a Sphere — Calculate the surface area of a sphere based on its radius
  • Volume of a Sphere — Calculate the volume of a sphere using radius or diameter
  • Slackline Tension — Calculate the approximate tension of a slackline or clothesline. Do not rely on this for safety.

PNG Tools

Tools for working with PNG images – convert PNGs to JPGs, create transparent PNGs, change PNG colors, crop, rotate, resize PNGs, and much more.


  • Compress png — Quickly compress a PNG
  • Convert JPG to PNG — Quickly convert your JPG images to PNG

XML Tools

Tools for working with XML data structures - viewer, beautifier, validator and much more


  • XML Beautifier — Format and beautify XML code
  • XML Validator — Validate XML code for errors

GIF Tools

Tools for working with GIF animations – create transparent GIFs, extract GIF frames, add text to GIF, crop, rotate, reverse GIFs, and much more.


  • Change GIF Speed — Change GIF animation speed

Converter Tools

Tools for converting data between different formats – convert images, audio, video, text, and more.


  • Audio Converter — Convert audio files to various formats.
  • Convert Images to WebP — Convert Images to WebP Format with quality control.
  • Convert Images to JPG — Convert images to JPG Format with quality control

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