🧰 All Tools

Browse all the free online tools of the box treasure toolbox: development, office, pictures, audio and video, conversion, life, finance and other categories, all the tool data is processed locally, no login, no installation.

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DevOps

JSON formatting/validation

Format, compress, validate JSON, mark error locations

JSON Comparison

Semantic Comparison of Differences Between Two Segments of JSON

Base64 Encoding/Decoding

Text to Base64 conversion (supports UTF-8)

URL Encoding/Decoding

URL encoding and decoding (encodeURIComponent)

Parse URL Parameters

Parse URL and query parameters, support encoding/decoding viewing

Hash calculation

MD5 / SHA1 / SHA256 / SHA512

Decode JWT to show header/load and expiration time

Timestamp Conversion

Unix timestamp ↔ date, automatically recognizing seconds/milliseconds

Real-time matching, highlighting, extracting groupings

Cron Expression Parsing

Parsing 5-segment Cron and Predicting Next 5 Execution Times

chmod permission calculator

Digital Mode ↔ Symbol Mode conversion

IP/CIDR calculation

IPv4 segment, network address, number of hosts available

Batch Generate UUID v4

Naming Style Conversion

Hump/Serpentine/Short Horizontal/Pascal/Constant

Unicode encoding/decoding

Text ↔ \uXXXX conversion

YAML/JSON/CSV/XML conversion

JSON and CSV/XML interchange, YAML needs to load the parsing library on the Internet

TOTP dynamic verification code

Generate 2FA verification code based on shared key (RFC6238)

Snowflake ID resolution

Time/Machine/Sequence to parse Twitter Snowflake ID

.gitignore generator

Check Language/Frame to generate .gitignore

ASCII code watch

0-127 characters/decimal/hexadecimal comparison

HTTP status code/MIME peek

Common Status Codes and Content-Type Queries

User-Agent resolution

Identify browser/system/device type

LLM Token Estimate

Heuristic estimation of the number of tokens in Chinese and English texts

QR Code Beautification

Custom Color & Center Logo

Generate scannable, saveable contact cards (Chinese text / vCard formats)

QR code scanning

Call the camera to identify the QR code in real time

AES encryption and decryption

AES-GCM encryption based on Web Crypto

Hello world program

Output Hello World by programming language

ICP Filing Inquiry

Query the ICP filing information of the domain name

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Text Processing

Characters, words, lines, Chinese characters count

Text Deduplication

Deduplicate by line, keep order of first occurrence

Text to and from Morse code

Text Comparison

Compare two paragraphs of text line by line, mark additions and deletions

Password Generator...

Secure random password, configurable complexity

Markdown Editor

Markdown editor with live preview

Markdown to Official Account

Convert to public image HTML with inline style

SVG Edit Preview

Edit SVG online and preview in real time

Draw flowchart/timing diagram with text

LaTeX Equation Editor

Enter the LaTeX rendering math formula (KaTeX)

Emoji and Symbols

Search and copy emojis/special symbols

Read locally in your browser, in both Chinese and English

Mars Conversion

Simplified Chinese and Martian interchange

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Image Tools

Select size → upload → crop/rotate/resize → export PNG/JPG, supports solid-color background replacement, fully local processing.

Image compression

Local compression JPEG/PNG, adjustable quality

Image Format Conversion

PNG/JPEG/WebP conversion

File to Base64, or decode to file download

Favicon Generator

Generate favicon with text/emoji

Placeholder Map Generation

Generate SVG placemap with customizable size/text/color

Convert Picture to Character Drawing

Image Rotation Flip

Rotate 90°/180° or flip horizontally and vertically

Images with watermarks

Add a tiled text watermark to your image

Image Border Radius

Add rounded corners to images, output transparent PNG

Nine palaces lattice cutout

Cut the picture into 3 × 3 nine palaces (circle of friends)

Picture filter color palette

Filters for brightness/contrast/saturation/grayscale/vintage, etc.

Process images in a retro pixel style

Image grayscale/black and white

One click to grayscale or pure black and white

Image Zoom/Resize

Customize the width and height, enlarge or reduce the image

Image steganography (hidden text)

Quietly hide a paragraph of text in the pixels of an image

Upload an image and add top/bottom text to make a meme

Text Recognition OCR

Image to text, support Chinese and English, local recognition does not upload

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Conversion & Encoding

Temperature Conversion

Celsius/Fahrenheit/Kelvin conversion

Color Format Conversion

Hex/RGB/HSL interchange

HTML entity encode and decode

Text and HTML entities are converted to each other

Text to Base32 (RFC4648)

Angular Radian Conversion

Angle/Radian/Percent Gradient conversion

Length/Weight/Temperature/Area/Volume/Speed/Time

Metric Calculator

Binary/octal/decimal/hexadecimal interchange

Four operations and common functions

Time Zone Conversion

Convert time in one time zone to another time zone

Roman Numerals Conversion

Arabic Numbers ↔ Roman Numbers conversion

Storage Unit Conversion

B/KB/MB/GB/TB conversion (including 1000 and 1024 base)

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Random Generators

Generate random strings of specified length and character set

Randomization Date

Generate random datetime within the specified range

Generate random street addresses of provinces, cities and districts in China (for testing)

Random phone number

Generate a random 11-digit phone number (for testing)

Random Motivational/Philosophical Phrases

QR code generation

Text/Link Generation QR Code

Barcode Generation

Generate CODE128 barcode

Mock data generation

Generate structured test JSON data

Text generation

Generate Lorem/Chinese Test Text

Random number generation

The specified range generates a random integer that can be deduplicated

Random name generation

Generate random Chinese/English names

Random color generation

Randomly generated color scheme with hex/RGB

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Office Documents

Multiple PDFs merged into one (local processing)

Split each page into separate PDFs and package them for download

PDF compression

Repack to reduce volume (lightweight)

Package multiple files into a zip

Unzip zip and download one by one

Bulk generation of QR codes

One content per line, batch generated and packaged

Render PDFs per page as PNG images and package them for download

Multiple images (JPG/PNG) merged into one PDF

Rotate all PDF pages 90/180/270 degrees

PDF Delete Page

Delete the specified page, e.g. 1,3,5-7

PDF Extract Text

Extract optional text content from PDF

PDF Watermarking

Add text watermark to each page (tile, adjustable transparency)

Excel to CSV/JSON

Upload xlsx/xls, export as CSV or JSON

Paste or upload CSV to export as xlsx

Excel online preview

Browser Local Preview Excel Table Contents

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Audio & Video

Video compression

H.264 Recode Compressed Video Volume (ffmpeg)

Video Format Conversion

MP4/WebM/MKV/MOV/AVI etc. interchange

Video Extraction Audio

Detach track from video and export MP3

Capture video clips by start and end time (ffmpeg)

Video Sound Removal

Remove video track, output muted video

Video Change Resolution

Scale video to specified width (isometric height)

WAV/M4A/FLAC/OGG iso-MP3

Video information viewing

View video encoding, resolution, duration, bitrate, and more

Online tape recorder

Call microphone recording to export audio file

Screen Recording

Record screen/window (including system sounds)

MP3/OGG/M4A/WebM etc. to lossless WAV

Capture audio clips and export WAVs

Multiple segments of audio are sequentially stitched into one WAV

Adjust volume and add fade to export WAV

Capture video clips to generate GIFs

Video truncation

Capture an image from any point in time in the video

Multiple Picture Composite GIFs

Audio information viewing

View audio duration, sampling rate, channel, etc.

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Daily Utilities

Multi-Time Zone Real Time Clock

Positive chronograph stopwatch

Focus for 25 minutes/rest for 5 minutes

BMI was calculated

Height, weight, BMI and size

Calculation of age

Calculate exact age based on birthday

Ten-thousand Year Calendar

Calendar view for any year and month

Time difference calculation

How long is the difference between the two dates

Relative Salutation

Common kinship titles query

Hanzi to Pinyin

Chinese to Pinyin (with tone)

Simple Conversion

↔ Simplified Chinese

Identity card analysis

Verify 18-digit ID and parse information

Where the phone number belongs

Judge the operator according to the number segment (reference)

Randomly draw one from the list

Make a decision

Random selection of carousels, goodbye to tangles

Action Group By

Randomize the list into N groups

Screen centimeters (in actual pixels, corrected for printing)

- Digital Protractor:

Enter the angle to view the schematic

Locally saved to-do lists

Handheld notes saved locally

What to eat today

Choose Difficulty Savior to help you decide at random

Handheld Barrage led

Full-screen scrolling text, suitable for airport pickup

Inquiries from capitals

Quickly search capitals by country name

Blood Group Inheritance Law

Calculate the child's possible blood type based on the parent's blood type

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Finance

Mortgage Calculator

Equal amount of principal and interest/principal, commercial loans/provident funds/portfolio loans

Car Loan Calculator

Equal Principal and Interest Car Loan Monthly

Consumer Loan Calculator

Equal amount of principal and interest/principal consumption loan

compute compound interest

Principal + compound interest growth of fixed investment

Individual Tax Calculator

Comprehensive income monthly withholding calculation (simplified)

Five insurances and one fund calculation

Estimated five-insurance-one-payment individual payment by base

Rate Conversion

Common Currency Conversion (Reference Exchange Rates)

Number Uppercase

Amount transferred to Chinese capitalization (RMB)

Split bill by number of people

Discount/Opportunity Calculation

Discounted price and on-hand price

Gross Margin Calculation

Cost/Selling Price Gross Margin and Markup Rate

ROI Measurement

Pension Calculation

Approximate Substitution Rate by Current Contribution Estimate

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Design & Frontend

CSS Triangle Generation

Generate triangles in any direction with border

Flexbox Layout Generation

Visually adjust flex properties and generate code

Contrast Testing

Test foreground/background color contrast for WCAG compliance

conversion of px, rem, em, pt units

Color Scheme Generation

Generate complementary/analog/monochrome color scheme based on primary color

Hex/RGB/HSL Interop & Palette

CSS Gradient Generation

Generate Linear/Radial Gradient CSS

CSS Shadow Generation

Generate box-shadow code

CSS Rounding Generation

Generate border-radius visually

Easing Curve Generation

Adjust cubic-bezier animation easing curve

Glass Mimicry Generation

Generate Frosted Glassmorphism Effect CSS

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Education & Exams

Geometric calculations

Volume area of circle/rectangle/triangle/sphere

Score Calculation

Fractional addition, subtraction, multiplication, division and reduction

Calculation of percentage

Percentage Increase/Decrease, Proportion, Difference

Molar Mass Calculation

Calculate molar mass based on chemical formula

Query elements and periodic tables (built-in data)

GPA Score Calculation

GPA weighted by credits (4.0 system)

Univariate quadratic equation

Solve ax ² + bx + c = 0

Prime number judgment, factorization, interval prime number list

Maximum common divisor/Least common multiple

Calculate multiple integer GCDs vs. LCMs

Oral Problem Generation

Generate elementary school verbal calculation exercises that can be printed

multiplication rhyme table

99 multiplication table, supports 9 × 9/12 × 12

Idiomatic Dragon Connection

Random idioms, or play dragon with friends

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Entertainment & Games

Slot Random Draw

Constellation Query

Enter birthday constellation and date range

Enter the year of the Chinese zodiac

Random Truth or Adventure

Random Brainstorm (see answer)

Draw grabbing ploughshares

Draw one randomly from multiple options

Positive or negative? Help you decide

1–6 dice can be rolled and summed

A guess-the-number game, aka Bulls and Cows

1–100 guess the number, see how many times you can guess

Rock-Paper-Scissors

Playing Stone Scissors Cloth with Computer

Classic Izai Chess, Two-Player Match

Reaction speed test

Measure how fast you react (milliseconds)

Random Net Name Generation

Generate great nicknames/usernames in one click