Gemini's chat window can now show a finished PDF, Google Doc, Google Sheet, slide deck, Markdown file, text file or piece of code, and edit it in place. You can expand the file to full screen and type, highlight a passage and ask a question about it, or ask for a change, such as turning a highlighted table into a graph. It is open to all users, but only PDFs work on the phone. Everything else needs the web version.
The chat remembers what the file was made from
Gemini could already edit documents before this. It has a bar inside Google Docs, and since March 2025 its Canvas space has let people highlight a paragraph and ask for it to be more concise. So the highlight is not the new part. The new part is that it now works on the finished file, including PDFs and spreadsheets, in the place where the file was made.
That place matters because the chat still holds everything the file came from: the photos, the pasted email, the instructions you gave in the first minute. An editor sees the file. The chat also knows why the file exists, and that is what lets a short request be enough.
For example, a shop owner asks Gemini to turn a supplier's price email into a customer price list in a spreadsheet. The supplier raised prices by 8%, and she wants the list to pass on only half of that. She highlights the price column and says so. She does not have to explain which column, which supplier or what the list is for, because the chat already has all of it.
Pointing is cheaper than describing
A fix used to be a chain of small jobs. Download the file, open it in another app, find the spot, change it, and if you wanted Gemini's help again, upload it and describe where the problem was. Now the chain is one step: highlight the spot and say what you want.
The saving is small each time and large in total. Take a weekly report with five small fixes. If each one cost two minutes of downloading, opening, finding the place and uploading again, that is ten minutes a week, about a working day over a year for the one person who makes it. In the chat, each fix costs as long as it takes to type a sentence.
The bigger change is in how people will use the tool. When a second version is nearly free, people ask for it. Documents get better because someone tried three versions of a paragraph, not because someone wrote a better prompt. Anthropic has moved the same way in Claude, where documents and slides now appear and can be edited inside the chat. The chat is becoming the place where small documents get finished, and the separate editor is where they end up afterwards.
Where it stops
Gemini can produce Word and Excel files, but they are not on the list of formats it edits in the chat. An office that lives in Word and Excel still leaves the chat for the last step.
The phone limit matters more than it seems. A PDF is the format that is hardest to change by hand on a phone, and it is the one format that works there. A person who sends a quote or a letter from their phone can now fix it on the phone, which is where most small fixes are noticed anyway.
When a fix is one highlight away, the risk is that nobody reads what changed. A table turned into a graph can lose a row without anyone noticing, and a price column adjusted by a percentage should still be checked against one number you know. Read the part Gemini changed before the file goes to anyone else.