Input
Choose Algorithm
Result
Online Hash Tool
Supports 11 common algorithms such as MD5, SHA-256 and SHA-512. Data is calculated locally in your browser.
FAQ
Is MD5 secure?
MD5 is a hash algorithm, not encryption. It is useful for checksums and low-risk integrity checks, but it has known collision risks. Use SHA-256 or SHA-512 for stronger security.
How is hashing different from symmetric encryption?
Hashing is one-way and is used for verification. Symmetric encryption, such as AES, can encrypt and decrypt data with a key.
Is Base64 an encryption algorithm?
No. Base64 is an encoding format that converts binary data to text. Anyone can decode it, so it should not be used for secrets.
Will my data be uploaded to the server?
No. Hashing and Base64 operations run locally in your browser, and your input is not sent to the server.
Image Toolbox
Compress, convert, crop, watermark and merge images into PDF. Files are only processed temporarily.
Upload Image
๐
Click or drag image here
Supports JPG / PNG / WebP / GIF / BMP / TIFF / ICO, max 20 MB
Lower quality, smaller file
Higher quality, larger file
Upload Image
๐
Click or drag image here
Supports JPG / PNG / WebP / GIF / BMP / TIFF / ICO, max 20 MB
Upload Image
๐
Click or drag image here
Supports JPG / PNG / WebP / GIF / BMP / TIFF / ICO, max 20 MB
Upload Image
๐
Click or drag image here
Supports JPG / PNG / WebP / GIF / BMP / TIFF / ICO, max 20 MB
Upload Images (max 20)
๐
Click or drag images here (multiple allowed)
Supports JPG / PNG / WebP / GIF / BMP, max 20 MB each
FAQ
Will image compression reduce quality?
Lower quality settings create smaller files but may reduce visual quality. A setting around 70-85 usually balances size and appearance well.
Which image formats can be converted?
JPG/JPEG, PNG, WebP, GIF, BMP, TIFF and ICO are supported. WebP is usually smaller for web pages, while ICO is useful for favicons.
Can image-to-PDF handle multiple images?
Yes. You can merge up to 20 images into one PDF, with each image placed on its own page.
Are uploaded images stored on the server?
No permanent storage is used. Images are only held temporarily while processing and are released after the task finishes.
Random Generator
Generate passwords, strings, UUIDs, numbers and colors locally and safely.
FAQ
Are generated passwords secure?
Passwords are generated with the browser crypto API and are not uploaded. Use at least 12 characters with mixed letters, numbers and symbols.
What is the difference between UUID and GUID?
They refer to the same general standard. GUID is common in Microsoft contexts, while UUID is the broader term. This tool generates standard UUID v4 values.
Which color formats are generated?
The tool outputs HEX, RGB and HSL formats so the result can be used directly in CSS and design tools.
Timestamp Converter
Convert Unix timestamps and date/time values locally, with automatic second/millisecond detection and time zones.
Current Time
Seconds
-
Milliseconds
-
Beijing Time
-
Timestamp to Date
Result
Local Time
-
UTC Time
-
Timestamp (s)
-
Timestamp (ms)
-
Weekday
-
Detected Unit
-
Date to Timestamp
Result
Timestamp (s)
-
Timestamp (ms)
-
UTC Time
-
Weekday
-
FAQ
What is a Unix timestamp?
A Unix timestamp is the number of seconds, or milliseconds, since 1970-01-01 00:00:00 UTC. It is a common time format in programming.
How do I tell seconds and milliseconds apart?
Second-level timestamps usually have 10 digits, while millisecond timestamps usually have 13 digits. This tool detects the unit automatically.
How many hours apart are Beijing time and UTC?
Beijing time is UTC+8, which is 8 hours ahead of UTC. For example, 10:00 UTC is 18:00 in Beijing.
JSON Tool
Format, minify, validate and escape/unescape JSON and Unicode locally.
Input JSON
Output
Input JSON
Output
Input Text
Output
Escaped Text
Output
Input JSON
FAQ
What are JSON formatting and minifying used for?
Formatting adds indentation and line breaks for reading and debugging. Minifying removes unnecessary whitespace for smaller payloads.
What is Unicode escaping?
Unicode escaping converts non-ASCII characters into \uXXXX sequences. Unescaping converts those sequences back into readable text.
Will my data be sent to the server?
No. JSON parsing, formatting, minifying and validation are handled locally in your browser.
QR Code Tool
Generate and decode QR codes for text, URLs, vCards, WiFi, phone and more locally.
Content Type
Text
URL
Phone Number
Upload QR Image
๐ท
Click or drag QR image here
Supports JPG, PNG, GIF, WebP and more
Decoded Result
FAQ
Can generated QR codes be used commercially?
Yes. The QR codes generated here can be used in commercial materials. Please make sure the encoded content itself is lawful and appropriate.
How do I generate a WiFi QR code?
Choose the WiFi type, enter the network name, password and encryption type, then generate the QR code. Scanning it can help users join the network.
Does long QR content affect scanning?
Yes. Longer content makes the QR code denser and may reduce scan reliability. Short URLs or concise text are recommended.
ICP Filing Lookup
Enter a domain to query China ICP filing info such as filing number, organizer and site name.
Filing Info
| Domain | |
|---|---|
| ICP No. | |
| Organizer | |
| Type | |
| Site Name | |
| Review Time |
Data comes from the MIIT filing system and is for reference only. For the latest information, visit the MIIT official site.
FAQ
What is ICP filing?
ICP filing is the website filing requirement for sites hosted or operated in mainland China. It is usually handled through the hosting provider.
What does an unfiled result mean?
It may mean the domain has no ICP filing, the filing is not public yet, or the domain was entered incorrectly. You can also verify on the MIIT website.
What does an ICP number look like?
A typical ICP number includes a province name, ICP label, year and serial number, such as Zhejiang ICP No. 2021020349-1.
Domain Whois Lookup
Enter a domain to look up registrar, registration date, expiry date, status and DNS servers.
Whois Info
| Domain | |
|---|---|
| Registrar | |
| Created | |
| Updated | |
| Expires | |
| Status | |
| DNS Servers |
Contact / Org
Data comes from public RDAP/Whois records and is for reference only. Some registrars hide contact email or organization fields.
FAQ
What information can Whois show?
Whois may show the registrar, creation date, update date, expiry date, domain status and DNS servers.
Why are some contact fields empty?
Many registrars hide personal contact information for privacy or compliance reasons, so public Whois records may omit those fields.
IP Address Lookup
Enter an IP or domain to look up location, ISP, coordinates, or query your public IP.
FAQ
What if the location result is inaccurate?
IP geolocation is based on public databases and ISP allocations, so it can differ from the real physical location.
Can private IP addresses be looked up?
Private addresses such as 192.168.x.x or 10.x.x.x are only used inside local networks and do not have public geolocation data.
Will this expose my personal information?
The lookup only queries IP-related public network data. It does not reveal your identity or private account information.
Stopwatch
A simple online stopwatch with start, stop, lap and reset for sports, study and work.
00:00.00
Ready
Lap Records
No records
Lap times will appear here after you click Lap.
FAQ
Will timing records be uploaded?
No. Stopwatch records are kept in the current browser page only.
Will timing continue after closing the page?
No. Closing or refreshing the page clears the in-page stopwatch state.
Which keyboard shortcuts are supported?
When the stopwatch page is active, A starts or stops, S records a lap, and C resets the timer.
Calendar
View Gregorian/lunar calendar, solar terms and holidays, with month navigation.
| Sun | Mon | Tue | Wed | Thu | Fri | Sat |
|---|
FAQ
Are lunar calendar and yin calendar the same?
In daily usage they often refer to the same Chinese lunar calendar system, though the formal calendar also includes solar terms.
What are the 24 solar terms?
The 24 solar terms divide the year by the sun position and are used in traditional Chinese calendars and agriculture.
Should almanac suggestions be treated as facts?
Almanac notes are traditional references for culture and entertainment. They should not be used as professional advice.
Chinese Zodiac & Western Zodiac
Enter your birthday to find Chinese zodiac and Western zodiac locally.
Result
Chinese Zodiac
Zodiac Sign
Birth Date
Stem-Branch Year
Date Range
FAQ
Is the Chinese zodiac based on the lunar year or Gregorian year?
Chinese zodiac signs are traditionally based on the lunar calendar year, so dates near Lunar New Year need special attention.
How are Western zodiac date boundaries determined?
Western zodiac signs are based on the Gregorian birth date and standard date ranges for each sign.
What are heavenly stems and earthly branches?
They are a traditional Chinese cycle used for years, months, days and hours, combining 10 stems and 12 branches.
RMB Uppercase
Convert numeric RMB amounts to Chinese financial uppercase text locally.
FAQ
How is financial uppercase different from normal Chinese numerals?
Financial uppercase numerals use special characters to reduce tampering in contracts, invoices and accounting documents.
How is the amount shown when jiao and fen are both zero?
The result ends with the yuan unit and the standard whole-amount marker.
What amount range is supported?
The tool is designed for common document and accounting amounts. Extremely large values may be rejected or should be checked manually.
Case
Convert English letters to uppercase, lowercase or title case locally.
Input
Result
FAQ
Will case conversion upload my text?
No. Case conversion runs locally in the browser.
Will non-English characters be changed?
No. Only English letters are affected; numbers, punctuation and other scripts remain unchanged.
Base Conv.
Enter a number in any field to convert it between decimal, binary, octal and hexadecimal. Useful for development, debugging and learning.
Enter Any Base
Supports integers and negative numbers. Hex values can use A-F. Conversion runs locally in your browser.
FAQ
Will base conversion upload my input?
No. Conversion is calculated locally in your browser.
Are decimals supported?
This tool focuses on integer conversion between decimal, binary, octal and hexadecimal.
URL Codec
Encode/decode URLs, query parameters and special characters locally.
Input
Paste a URL, query parameter or text, then choose an encode/decode mode.
Result
FAQ
What is the difference between URL encoding and parameter encoding?
URL encoding handles a full URL, while parameter encoding is intended for a single query parameter or text fragment.
Will my input be uploaded to the server?
No. Encoding and decoding are completed locally in your browser.
Chinese Conv.
Convert Chinese text between Simplified and Traditional Chinese locally.
Input
Result
FAQ
Will Simplified/Traditional conversion upload my text?
No. Conversion runs locally in the browser.
Will the result exactly match OpenCC?
Not always. This tool uses local phrase and character mappings and may differ from OpenCC in some wording choices.
Coord. Range
Calculate TCP world coordinates, reachable range and single-axis motion bounds from robot parameters.
Robot Params
Designed for a three-link planar SCARA structure. Length is in millimeters and angles are in degrees by default.
ABC Link Length
Axis Offset
XYZ Position
ABC Angles
XY Reach Projection
Light blue dots are sampled reachable points. The yellow polyline shows the current pose.
Current TCP / World Pose
X 0
Y 0
Z 0
A 0ยฐ
B 0ยฐ
C 0ยฐ
World Coord Range
X min 0
X max 0
Y min 0
Y max 0
Z min 0
Z max 0
A min 0ยฐ
A max 0ยฐ
B min 0ยฐ
B max 0ยฐ
C min 0ยฐ
C max 0ยฐ
Single-Axis Range
X min 0
X max 0
Y min 0
Y max 0
Z min 0
Z max 0
FAQ
What robot structure is this tool for?
It is intended for SCARA-style arm calculations using link lengths, axis offsets and current pose parameters.
Is higher sampling density always more accurate?
Higher density can improve the estimate but increases computation time. Choose a practical value based on the precision you need.
Will data be uploaded to the server?
No. Coordinate calculations run locally in the browser.
Word Count
Count characters, Chinese characters, English words, digits, lines and paragraphs locally in real time.
Input Text
Stats
0
Chars
0
Non-space Chars
0
Chinese Chars
0
English Words
0
Letters
0
Digits
0
Spaces
0
Lines
0
Paragraphs
FAQ
What is the difference between total characters and non-space characters?
Total characters include spaces and line breaks. Non-space characters exclude whitespace.
How are English words counted?
English words are counted from letter and number sequences separated by spaces or punctuation.
How is the Chinese character range defined?
The tool counts common CJK unified ideographs as Chinese characters.
How are paragraphs counted?
Paragraphs are counted from non-empty text blocks separated by line breaks.
Regex
Enter a regex and test text to preview matches, count, position and results locally.
Pattern
Do not include the surrounding slashes. Select matching flags as needed.
Test Text
0Matches
-First Index
gFlags
Match Results
No matches
FAQ
Why is g enabled by default?
The global flag finds all matches so you can preview every matched result instead of only the first one.
Will the regex or text be uploaded?
No. Matching runs locally in the browser.
Friday Coding for Kids
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C++ Online Compiler
Run C++11 code with highlighting, compile errors, templates and saving, no install needed.
Loading editor
Standard Input (stdin)
Output
Click Run to execute
My Saves
No saved snippets yet
FAQ
Which C++ standard is supported?
The compiler is configured for C++11.
Is there an execution time limit?
Yes. Online execution is limited to prevent long-running or resource-heavy programs.
Is the code execution safe?
Code runs in a restricted server-side environment, but you should not enter secrets or sensitive information.
Will my code be saved?
Only code you explicitly save is stored in your browser or account context. Unsaved code is not kept as a permanent record.
Friday Coding for Kids
Expert teachers ยท Fun courses ยท Guided growth
Python Online Compiler
Run Python with highlighting, syntax check, stdin, templates and saving, no install needed.
Loading editor
Standard Input (stdin)
Output
Click Run to execute
My Saves
No saved snippets yet
FAQ
Is there an execution time limit?
Yes. Online execution is limited to keep the service responsive and prevent runaway programs.
Is the code execution safe?
Code runs in a restricted environment, but do not enter passwords, tokens or private data.