Fix grammar, spelling, and punctuation in your text with your own AI API key. Your voice stays intact, nothing else changes.
Use your own API key to get started.
No AI provider key configured
Click "Use Your API Key" above and add a Gemini, OpenAI, Anthropic, Z.AI, Kimi, MiniMax, or DeepSeek key. The key is stored in your browser only (sessionStorage) and sent directly to the provider you pick. See the BYOK tools page for how bring-your-own-key works and where to get each key.
Traditional grammar checkers flag problems and leave you to fix them one by one. This tool does the whole pass at once: it corrects grammar, spelling, and punctuation errors and returns the cleaned text beside your original so you can compare them directly. The instructions are strict about scope: errors only. Sentence structure, word choice, and voice are left alone unless an actual mistake requires the change, so a casual email stays casual and a formal report stays formal. Tick the "list the changes" box and the model also appends a brief rundown of what it corrected, which doubles as a quick proofreading lesson.
This is a bring-your-own-key (BYOK) tool powered by the provider you select: Gemini, OpenAI, Anthropic, Z.AI, Kimi, MiniMax, or DeepSeek. Your key is added through the "Use Your API Key" button and stored in your browser only; the request passes through our proxy to reach the provider, and nothing is kept after the response returns. You pay only your provider's normal per-request cost. If a provider errors out, switch to another configured one and run the pass again. The "Apply fix to input" button copies the corrected text back into the input pane so you can fix, review, and iterate without retyping.
Models are strong but not infallible proofreaders: they can miss errors in long, tangled sentences or occasionally "correct" a stylistic choice you made on purpose. Read the diff before shipping anything important. For related jobs, reword a whole passage with the AI Paraphraser, compare two versions line by line with Text Diff, or condense a long draft with the AI Text Summarizer.
No. The prompt restricts the model to grammar, spelling, and punctuation corrections only, and instructs it to preserve your wording, sentence order, and tone. Style is deliberately out of scope; if you want a full rewording, use the AI Paraphraser instead.
When ticked, the model is asked to append a section titled "CHANGES" below the corrected text, briefly describing each correction it made (for example, "their" to "there" in sentence 2). The tool parses that section out and shows it as a bulleted list so the output pane stays clean.
Use it to iterate. It replaces the left pane with the corrected text so you can run a second pass, continue writing from the clean version, or make manual edits and fix again. Your previous text is overwritten, so copy anything you want to keep first.
Your text goes from your browser through the Kit Utility proxy to the AI provider you selected, and it is not stored by us after the response returns. Your API key lives only in your browser sessionStorage. As with any AI provider, avoid pasting secrets or legally sensitive material you would not send to that provider.
Often yes. The major providers proofread competently in widely used languages, though accuracy varies by language and provider. Errors are still limited to grammar, spelling, and punctuation; the text stays in whatever language you paste.