Available
TOOLS-02
Email header analyzer
Explain delivery hops and summarize SPF, DKIM and DMARC evidence without claiming absolute authenticity.
No input upload
Open tool Processed in your browser
Privacy-first email tools
Focused utilities for inspecting email security and protecting test accounts. Every tool is built by Once Email and processes your input in this browser.
Local archive assistant
UnpackFlow
Choose one attachment folder. UnpackFlow finds ordinary, split, nested, and self-extracting archives, previews the plan, extracts them locally, and keeps failures visible.
Linux · macOS · Windows · Open source · v2.1.9
Available
TOOLS-03
Email link and tracker checker
Inspect pasted email HTML for risky links, hidden images and remote tracking clues without rendering it.
No input upload
Open toolAvailable
TOOLS-04
Secure password generator
Create strong passwords and passphrases locally using the browser cryptography API.
No input upload
Open toolAvailable
TOOLS-06
Base64 text encoder and decoder
Encode UTF-8 text to Base64 or decode Base64 text locally without uploading it.
No input upload
Open toolAvailable
TOOLS-07
URL encoder, decoder and query inspector
Encode URL components or inspect query parameters locally without opening the address.
No input upload
Open toolAvailable
TOOLS-08
SHA-256 and SHA-512 text hash generator
Generate SHA-256 or SHA-512 text hashes locally with browser Web Crypto.
No input upload
Open toolAvailable
TOOLS-09
JSON formatter and validator
Format, minify and validate JSON locally without uploading it.
No input upload
Open toolAvailable
TOOLS-10
Private QR code generator
Create and download QR codes locally without sending text to a server.
No input upload
Open toolAvailable
TOOLS-11
Image compressor and format converter
Resize, compress and convert JPEG, PNG or WebP locally. Your image never leaves this browser.
No input upload
Open toolAvailable
TOOLS-12
Text counter and cleaner
Count and tidy text in this browser without uploading your content.
No input upload
Open toolAvailable
TOOLS-13
Email subject and preview simulator
Check how sender, subject and preview text may fit in a compact inbox row before running a real client test.
No input upload
Open toolAvailable
TOOLS-14
Email date and Unix timestamp converter
Translate explicit ISO 8601 timestamps, Unix seconds and Unix milliseconds while debugging delivery records.
No input upload
Open toolAvailable
TOOLS-15
Email verification code extractor
Paste an email to find its likely verification code and copy the best match automatically.
No input upload
Open toolAvailable
TOOLS-16
Email HTML to plain text extractor
Turn pasted email HTML into readable plain text without rendering active or remote content.
No input upload
Open toolAvailable
TOOLS-17
Email attachment size budget
Estimate how selected attachments may grow after Base64 and MIME packaging before sending an email.
No input upload
Open toolAvailable
TOOLS-18
Email address privacy checker
Explain what an email address may reveal from its visible structure without verifying, contacting or uploading it.
No input upload
Open toolLocal by design
Input is handled only after you choose to run a tool. It is not placed in URLs, logs, analytics, storage or server requests.
Released only after verification
A tool becomes public only after security, accessibility, mobile, Top 10 language and no-network-leakage tests pass.
No input upload
This work area does not upload, persist or send your input to analytics. Clear the page when you finish.