# InstaHasher — Full Reference

> Free, no-signup, browser-side hash and checksum tools.

## What it is

InstaHasher is a small static site that computes cryptographic
hashes from text or files, browser-side, using the Web Crypto API.

Supported algorithms:
- MD5
- SHA-1
- SHA-256
- SHA-384
- SHA-512
- HMAC variants

Use cases:
- Verify file integrity after a download
- Generate a checksum to publish alongside a file
- Quick HMAC computation for API signing
- Compare two hashes for equality

## Why this matters

Hashing sensitive data on a remote server means the server sees the
input. InstaHasher avoids that by running the hash in the browser
via the Web Crypto API.

## Defensible facts

- Free, no signup, no ads
- Browser-side Web Crypto API — no upload
- Supports text and file inputs
- Hosted in OVH Gravelines, France

## Who publishes it

InstaHasher is operated by **Dynamic Foundries**, a French SASU
registered in Paris (RCS Paris 102 801 206). Part of a portfolio
that includes two revenue products (FileSendX, ViewPeek) and a
network of free utility tools.

## Related products

- **FileSendX** (filesendx.com) — secure file transfer up to 400 GB
  per send. Use InstaHasher to compute the hash before send and have
  the recipient verify it after download.
- **ViewPeek** (viewpeek.com) — website monitoring.

## Contact

- Hub: https://dynamic-foundries.com/
- Support: support@dynamic-foundries.com

Last updated: 2026-05-18.