Adler-32 Checksum Calculator

Calculate the Adler-32 checksum of text or files, supports single and batch processing, and verifies data integrity.

Browser execution mode: Your data is processed in your browser and is not uploaded to the server.

Speed and Stability: Processing speed depends on your device and browser. For large batch work, the desktop version may be more stable.

Loading tool, please wait...

If the online tool fails to load or run, try the desktop tool.https://tools.yikeaigc.com/

Tool Usage

Return to old version

Prepare text or files, set the output format, then calculate and export results.

Supports text, single file, and batch file calculation. Batch mode processes all files; only the first 20 are shown for review.

Adler-32 Text & Files Checksum Verification CSV / JSON / ZIP Savable settings

Current task Text input

Input0

Data size0 B

Output formatAll

Enter text or select a file in Step 1 first.

Input data

Choose a data source. Text mode converts to bytes using the encoding in Step 2; file mode uses the original binary content.

Text content Use sample data for quick testing

Select a file Supports any file format

Click to select files, or drag files here Calculated from the file's original bytes; file content is not changed.

Select multiple files Shows the first 20; all are processed

Click to select multiple files, or drag files here After completion, download CSV, JSON, or a ZIP result package.

File Review No files selected

#	File Name	Size	Type	Last modified
After selecting files, the first 20 will appear here.

Set options

Text calculation requires encoding confirmation. File calculation reads binary content directly, so encoding settings do not affect file results.

Basic settings Try the default settings first

Text Encoding

Result Display

Hex style

Batch separator

Expected checksum

Export file prefix

Export Content Batch export includes successful and failed records

Show A/B components Export binary result Export file metadata Auto-verify after calculation

Calculate & export

After calculation, copy results, verify expected values, and export CSV, JSON, or ZIP archives.

Progress Waiting to calculate

Result Actions Calculate first, then copy or download

Calculation results

No results yet Unverified

Waiting to calculateSet parameters first, then click “Start Calculation”.

Hexadecimal

Decimal

Binary

A component

B component

Data statistics

Validation results Compare with the expected checksum entered in Step 2

#	File Name	Size	Adler-32 Hex	Adler-32 Dec	A	B	Status

Instructions

Software Usage Instructions

Input Data: Choose text input, a single file, or batch files. You can paste text content directly or click the sample data for quick testing.
Check Files: After uploading files, the tool will display the file name, size, type, and modification time. For batch files, only the first 20 are shown, but all files will be processed during calculation and export.
Set Parameters:
- Text Encoding: Supports UTF-8, ASCII, Latin-1, GBK, GB2312, GB18030, UTF-16 LE.
- Result Display: Choose all formats, or show only hexadecimal, decimal, or binary.
- Hexadecimal Style: Set whether to include the 0x prefix and choose uppercase or lowercase format.
- Expected Checksum: Enter an existing checksum to automatically compare it after calculation is complete.
Start Calculation: Go to the “Calculate and Export” step and click “Start Calculation” to generate the Adler-32 checksum.
View Results: Results will show hexadecimal, decimal, binary, A/B components, byte count, and elapsed time information.
Export Results: You can copy the main result or all results, download CSV or JSON, and download batch results as a ZIP package.

FAQ

A: Adler-32 is commonly used for data integrity checks, zlib compressed data verification, file transfer verification, and program debugging. It is suitable for detecting accidental corruption, but not as an encryption or authentication algorithm.

A: Yes. Adler-32 is calculated based on bytes. When the same text uses different encodings such as UTF-8, GBK, or UTF-16 LE, the byte sequences differ, and the resulting checksum may also differ.

A: Adler-32 consists of two 16-bit components. A is the accumulated byte value, and B is the accumulated value of A at each step. Both are taken modulo 65521 and combined to form a 32-bit checksum.

A: Files in any format are supported, including documents, images, audio, video, archives, and program files. The checksum is calculated based on the file’s binary content, regardless of its extension.

A: Adler-32 is relatively lightweight to compute and is common in zlib-related scenarios; CRC-32 generally has stronger error-detection capabilities. For general integrity checks, either can be used; if stronger error detection is required, consider CRC-type algorithms.

A: Common causes include changes to the file content, using a different text encoding, missing characters when copying the checksum value, mixing hexadecimal and decimal formats, or comparing different versions of the data.