Hash Calculator
Calculate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 checksums for any file up to 2 GB or text string. All computation happens locally in your browser — your data never leaves your device.
Calculate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 checksums for any file or text string, entirely in your browser. Files up to 2 GB are supported.
Drop a file here or click to browse
Supports any file type up to 2 GB
Large File Support up to 2 GB
Process files of any size — from tiny text snippets to 2 GB binaries — using chunked FileReader reads that keep the browser responsive. A live progress bar shows read and hash computation status in real time.
100% Local — Files Never Leave Your Device
All hashing runs entirely inside your browser. Your files and text are never uploaded to any server, ensuring complete privacy when verifying sensitive documents, firmware, or confidential archives.
Five Algorithms in a Single Click
Calculate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 simultaneously in one pass. SHA-* hashes use the browser's audited Web Crypto API; MD5 is computed via a built-in pure-TypeScript implementation for maximum compatibility.
100% Free — No Account Needed
Generate unlimited checksums at no cost. No subscriptions, no usage limits, no sign-ups. Open the page and start hashing immediately, whether you are online or offline.
Software Download Verification
Confirm that a downloaded installer, ISO image, or binary archive has not been tampered with. Compare the SHA-256 hash shown on the vendor's website against the hash computed locally to rule out corruption or supply-chain attacks.
File Integrity Monitoring
Generate baseline SHA-512 checksums for critical configuration files, database backups, or system binaries. Re-hash them periodically and compare to detect unauthorized modifications or storage bit-rot without any server-side tooling.
API & Webhook Payload Signing
Hash a JSON request body with SHA-256 to produce an HMAC-style fingerprint for payload signing validation. Paste the received body into the text mode and compare the hex digest against the signature header included by the sending service.
Password & Secret Storage Audit
Quickly compute MD5 or SHA-1 digests of legacy password strings to identify weak hash schemes stored in older databases and prioritize migration to modern bcrypt or Argon2 storage. All computation stays local, so no plaintext secrets are ever sent over the wire.
Firmware & Embedded Device Validation
Validate firmware binary blobs up to 2 GB before flashing them to embedded devices. Compute SHA-256 and compare against the manufacturer's published checksum to ensure the image is genuine and uncorrupted — entirely offline without specialized tooling.
Deduplication & Cache Key Generation
Generate MD5 or SHA-256 content-addressable keys for files, images, or data blobs before inserting them into object storage or CDN caches. Using a hash as a filename enables automatic deduplication and cache-busting without any backend infrastructure.
The Aback Tools Hash Calculator computes cryptographic checksums for files and text strings entirely inside your browser. No upload, no server round-trip, and no installation required. It supports five industry-standard algorithms — MD5, SHA-1, SHA-256, SHA-384, and SHA-512 — and handles files up to 2 GB via a chunked reading strategy that keeps the browser responsive.
How Hashing Works
A hash function takes an arbitrary-length input and produces a fixed-length digest. Even a single-bit change in the input produces a completely different digest (the avalanche effect), making hashes ideal for integrity verification. Our tool applies each selected algorithm to the complete binary content of the file or the UTF-8 encoding of the input text.
Algorithm Comparison
MD5 (128-bit) is the oldest supported algorithm. It is fast and universally available but is no longer considered cryptographically secure — collision attacks have been demonstrated. It remains useful for non-security checksums such as download integrity or deduplication keys where speed matters more than collision resistance.
SHA-1 (160-bit) was a successor to MD5, offering a larger digest and better security. However, SHA-1 is also deprecated for new security applications following successful practical collision demonstrations. It continues to appear in legacy Git object IDs and some older certificate formats.
SHA-256 (256-bit) is the most widely recommended general-purpose hash today. It is part of the SHA-2 family standardized by NIST, used in TLS certificates, code-signing pipelines, Bitcoin, and countless API signature schemes. Use SHA-256 for all new integrity and authentication work.
SHA-384 and SHA-512 (384-bit / 512-bit) are larger SHA-2 variants that provide additional security margin. SHA-512 is often faster than SHA-256 on 64-bit processors because it processes 1024-bit blocks natively. Use these where maximum collision resistance is required, such as long-term document archiving or high-value asset signing.
Large File Processing
Files are read in 64 MiB slices using the browser's FileReader API, allowing the tab's event loop to stay responsive between chunks. Progress is reported on a 0–100 % scale that covers both the read phase (0–50 %) and the hashing phase (50–100 %). SHA hashes use crypto.subtle.digest() from the Web Crypto API, while MD5 is calculated with an audited pure-TypeScript implementation built into the page.
Privacy Guarantee
Because all processing happens client-side, your file data never leaves your machine. This makes the tool safe for hashing confidential contracts, personal backups, firmware binaries, and any other sensitive data that you would not want to pass through a third-party server.
Related Tools
RSA/ECDSA Key Generator
Generate cryptographically secure RSA and ECDSA public/private key pairs using the Web Crypto API - Free online key generator
Cryptographically Secure Password Generator
Generate high-entropy passwords with browser cryptographic randomness and policy controls - Free secure password generator
UUID / GUID Batch Generator
Generate batches of up to 10,000 cryptographically secure UUID v4 (random) or UUID v7 (time-ordered) identifiers in your browser - Free online UUID generator
AES File Encryptor/Decryptor
Encrypt and decrypt files locally using AES-256-GCM with PBKDF2 passphrase-based key derivation - Free online AES file encryptor
Frequently Asked Questions About the Hash Calculator
MD5 produces a 128-bit digest and is fast but cryptographically broken — do not use it for security. SHA-1 produces a 160-bit digest and is deprecated for security use. SHA-256 produces a 256-bit digest, is part of the SHA-2 family, and is the current best-practice for integrity checking, signatures, and authentication.
The tool officially supports files up to 2 GB. Larger files may work depending on your device's available RAM, but performance is not guaranteed. The chunked FileReader approach keeps the browser responsive during processing, and a live progress bar tracks both the read and hash phases.
No. All file reading and hash computation happen exclusively inside your browser using the FileReader API and the Web Crypto API. Your file data never leaves your device, making this tool safe for confidential documents, firmware binaries, and private backups.
MD5 remains useful for non-security tasks such as detecting accidental corruption during file transfers, generating cache keys, or verifying checksums on legacy systems that publish MD5 digests. The tool clearly surfaces which algorithms are suitable for security use and which are for compatibility only.
Use SHA-256 or SHA-512 for software download verification. Most reputable software projects publish SHA-256 checksums alongside their releases. Simply hash the downloaded file with this tool, compare the result against the published hash, and confirm they match exactly.
In text mode, your input string is first encoded to bytes using the UTF-8 standard, and the selected algorithms are then applied to those bytes. This matches the default behavior of command-line tools like sha256sum. The resulting hex digest uniquely represents that exact text string.
Yes. Select any combination of MD5, SHA-1, SHA-256, SHA-384, and SHA-512 before clicking Calculate. The file is read once and all selected hashes are computed sequentially, so running five algorithms together is nearly as fast as running one. Results can be copied or downloaded individually or all at once.