A tone changer that keeps your facts straight
The same message can land very differently depending on how it sounds. This tone changer rewrites an email, a chat message, a cover letter or a post in one of eight tones — formal, friendly, confident, empathetic, persuasive, neutral, apologetic or enthusiastic — with a formality slider and an optional note about who will read it.
Changing tone is exactly where AI tends to slip in new details: a friendlier version promises “a discount”, a formal one turns “Wednesday 22 October” into “next week”. So after every rewrite, code on the page lists each name, number, amount and date in your original and shows whether it is still there, and flags any new ones the model added. You decide what to send.
The rewriting runs on your device, using your browser’s built-in AI or IBM’s open Granite 4.0 model (Apache-2.0), which downloads only if you agree — so a sensitive message stays private.
How to change the tone of a message
- Paste your message into Your message, or open a text or Word file.
- Pick a Tone. The example underneath shows the same short message in that tone, so you know what to expect.
- Adjust Formality if needed (each tone sets a sensible default) and, optionally, describe who will read it — “a customer whose order is late”, “my manager”, “a new client”.
- Press Change tone. The new version appears as it is written; new wording is highlighted against your original.
- Read the Fact check. Anything “missing or changed”, and anything listed as not in your text, needs a look before you copy the message.
Tone Changer features
Eight tones with examples
Each tone is a short, specific instruction — for example, “confident” removes hedges such as “I think” and “just”; “apologetic” apologises once and says what happens next.
Formality slider
Five steps from very casual to very formal, so “friendly but professional” is one setting, not a guess.
Audience field
Tell the model who the reader is; the same apology reads differently to a customer and to a colleague.
Fact check after every rewrite
Names, numbers, money, percentages, dates, times, email addresses and links are compared before and after. “£1,240” and “1240” count as the same; “12” and “twelve” too.
Whole message in one go
Short messages are sent as a single piece so the tone stays consistent from greeting to sign-off; long documents are split between paragraphs.
The eight tones
| Tone | What the model is told | Use it for |
|---|---|---|
| Formal | Complete sentences, polite professional wording, no slang or contractions | Official emails, applications, complaints |
| Friendly | Warm and approachable; contractions are fine | Colleagues, regular customers, community posts |
| Confident | Direct; no hedging or unnecessary apologies | Proposals, status updates, negotiations |
| Empathetic | Acknowledge the reader’s feelings without exaggerating | Support replies, bad news, feedback |
| Persuasive | Benefit first, a clear reason, a clear request | Sales emails, requests for approval, fundraising |
| Neutral | Factual and even-handed; no loaded words | Minutes, incident reports, policies |
| Apologetic | One sincere apology, responsibility, what happens next | Delays, mistakes, missed deadlines |
| Enthusiastic | Upbeat, at most one exclamation mark | Announcements, thank-you notes, invitations |
Tips for getting the tone right
- Keep the facts in your original; the tone changer is told not to add any, but it is easier to check a message that already says everything.
- Describe the reader in a few words. “A customer whose order is late” gives the model more to work with than “customer”.
- For bad news, try Empathetic or Apologetic at formality 3–4: warm, but not chatty.
- If a version sounds over the top, lower the formality one step, or switch from Enthusiastic to Friendly.
- To shorten the result afterwards, use the Text Shortener; to reword it without changing the tone, the Paraphrasing Tool.
What the fact check can and cannot see
The check finds names (capitalised words and phrases), numbers with their currency or percent sign, dates such as “Friday 17 October” or “17/10/2026”, times, email addresses and links, and compares them in both versions. It treats equivalent forms as the same: “24 October” and “October 24th”, “10 am” and “10:00 a.m.”, “₹1,500” and “1500 rupees”.
It cannot judge meaning. If “we will refund” becomes “we may refund”, or a firm deadline becomes a soft one, no number changed and nothing is flagged — so read the new version all the way through. For long email threads, the Email Summarizer pulls out the requests and deadlines first.
Tone Changer FAQ
How do I make an email sound more professional?
Paste it into this tone changer, choose Formal, set formality to 4 or 5, and press Change tone. Then check the fact list and adjust anything that no longer sounds like you.
Is my message private?
Yes. It is rewritten on your device by your browser’s built-in AI or the open Granite model; only the model files are downloaded, once, after you agree. The audience you type stays on your device too.
Why did the tone changer add something I didn’t write?
Language models fill gaps with likely-sounding details, especially in persuasive or apologetic tones. That is why new names, numbers and dates are listed under the fact check — remove anything that isn’t true.
Can it change the tone of a long document?
Yes, but it works best on messages and short documents. Long text is processed in parts of a few paragraphs each, so the tone can vary slightly between parts.
What does the formality slider do?
It adds “formality N of 5” to the instruction, and with Chrome’s built-in rewriter it chooses between its more-casual, as-is and more-formal settings.
Which languages work?
English works best. Chrome’s built-in AI also handles Spanish and Japanese; the open Granite model understands about a dozen languages with lower quality.