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Free email subject line generator

Paste the email you have already written. Get subject lines that match what is actually in it, best first.

Ten free runs a day No account Nothing you paste is stored

Nothing is sent anywhere. You get text back and decide what to do with it.

Try another free tool Write an email Reply to an email Notes to email Angry to polite Change the tone Rewrite in another language Translate an email Tasks from an email Tasks from meeting notes Brain dump to task list

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An example

Before, after, and what moved

An email asking a client to approve a revised scope before Friday.

Before

Subject: Update

After

1. Revised scope for approval, need it by Friday (48 chars) 2. Scope v2: one workstream out, price down 12% (46 chars) 3. Friday deadline: revised Acme scope (37 chars)

1

Specific beats clever

A subject line that names the document and the deadline outperforms a curiosity gap in work email, because your recipient is triaging rather than browsing.

2

Under fifty characters

Mobile clients cut somewhere around forty to fifty. Anything past that is written for a desktop inbox that half your recipients are not using.

3

The deadline moved into the subject

It was in the last paragraph of the email. In the subject it changes when the email gets opened, not only whether it does.

How it works

Three steps, about five seconds

01

Paste the finished email

This works backwards from the body on purpose. A subject line written before the email describes what you meant to say.

02

Pick an angle

Direct, curious, or specific. Specific wins for work email almost every time.

03

Take the top one

They come back ranked with character counts, so you can see which ones survive a phone screen.

The rules it follows

Boring and specific beats clever

What makes a work subject line open, and what makes it get skipped.

What tends to work

  • Naming the document or the project
  • Putting the date or deadline in the line
  • Under about fifty characters
  • Saying what you want, not that you want something
  • Changing the subject when you restart a dead thread

What tends to fail

  • "Update", "Quick question", "Touching base"
  • Curiosity gaps in professional email
  • ALL CAPS or a row of exclamation marks
  • Reusing a subject line for a different topic
  • Anything that reads like a marketing campaign
What people paste in

The jobs it gets used for

A long email that needs openingSix paragraphs nobody reads if the subject is "Update".
A follow-up to a dead threadReusing the old subject line is why it is still dead.
A request with a deadlineThe date belongs in the subject, not paragraph three.
Sending to a full inboxSomeone with four hundred unread decides in the preview pane.
Internal announcementsRead by everyone, skimmed by most.
Cold outreachWhere the subject line is the entire first impression.
Beyond one email

One email, rewritten once. Pidgy does the other forty.

This page needed a dropdown because it has never seen you write. Pidgy learned your voice from your own sent folder.

It already knows the tone

Your register with a long-standing client is not your register with a cold enquiry. Pidgy picks it up from how you have written to that person before.

It works on everything

Not the one email you remembered to paste. Every email, drafted as it arrives, sitting in your drafts folder when you open the inbox.

Nothing sends itself

Pidgy drafts, queues and chases. The send button stays yours on every single message.

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The rest of the toolbox

Tasks from an emailPaste a thread. Tasks from meeting notesPaste the notes. Brain dump to task listEverything you are carrying, in one box, in any order. Write an emailDescribe what you need to say in a line or two. Reply to an emailPaste the email you received and a few words about what you want to say back. Notes to emailBullets, fragments, half sentences scribbled during a call.
Questions

Questions, answered

Is it really free?
Yes. Ten runs a day across all the Pidgy free tools, with no account and no card. You only see the counter once three runs remain.
Why does it need the whole email?
Because a subject line is a summary, and you cannot summarise something that does not exist yet. Working from the body is why these come back specific rather than generic.
How long should a subject line be?
Under about fifty characters is a safe target, because mobile clients truncate somewhere in the forties. The tool shows a character count on each one so you can judge it yourself.
Is it for marketing emails?
It works for both, but it is tuned for one-to-one professional email, where specific outperforms clever. A campaign subject line for a list of ten thousand is a different craft.
Should I change the subject on a reply?
If the topic has moved, yes. A thread called "Re: Re: Re: kickoff" that is now about an invoice is a thread nobody can find in six weeks.
Do you store what I paste?
No. The text is processed to produce the result and not kept. The tool sets no cookies and needs no consent banner. One random id sits in your browser's local storage to count the free runs, and it identifies nobody.
How is this different from Pidgy?
This writes a subject line for one email. Pidgy drafts the whole email, subject included, in your voice, for every message in your inbox.

A subject line takes ten seconds. The inbox takes the rest of your day.

Pidgy reads all of it, hands you the five that need a decision, and drafts everything else in your voice.

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