Writing & MediaFree tool
Fact-Check Comments on Your News Draft
A comment on every checkable claim in your draft: what to confirm, the source that settles it, and what public sources already show.
Free to start · Opens in your River workspace, ready to edit and share
How to fact-check an article before publishing
Fact-checking an article before publishing means testing every factual claim in the near-final draft against the best available source. A good check breaks the story into separate facts: names, titles, ages, dates, numbers, quotes, descriptions and claims about cause. It confirms each one against an original record, recording or document, then fixes, attributes or cuts anything that doesn't hold. It also makes sure anyone the story criticizes had a fair chance to respond.
The rule beneath every step: confirm a fact where it started, not where you last read it. A figure repeated in 10 news stories is still unconfirmed if none of them went back to the record.
Mark every claim in the article
Wait until the draft is nearly final. Brooke Borel, author of The Chicago Guide to Fact-Checking, starts the check with the version the writer and editor feel is ready for scrutiny1. Her chapter of MIT's KSJ Science Editing Handbook has the checker read it at least once, then again line by line, checking each fact against its source.
Underline every fact as you go, then sort each one by type, since each type goes wrong in its own way. NPR's accuracy checklist, meant for its correspondents and producers, lists the things to "double- or triple-check." For ages, it says: "Get the date of birth and do the math." Claims to be the first, best or worst, it warns, "are often wrong; never trust them."2
Claims to mark, and where to confirm them
| Claim | What to check | Best source |
|---|---|---|
| Names | The spelling, and the same spelling every time | The person, or their organization's own site |
| Titles | The exact title, and that it's still current | The organization's staff page or roster |
| Dates and ages | The date, the weekday, and whether a birthday falls before publication | The official record; a birth date, not an age |
| Numbers | The math, the units, millions or billions | The original report, budget or dataset |
| Quotes | The exact words and the right speaker | Your recording or notes |
| Superlatives | Words like first, only, largest and record | The full record, or attribute the claim |
| Cause and effect | Words like caused, led to and because | Data or documents that show the link |
Keep style questions apart from fact questions. Whether to write "Gov." or "Governor" is for your house style guide to settle; whether she still holds the office is for the check.
Confirm each fact at its source
The Society of Professional Journalists' Code of Ethics, revised in October 2026, tells journalists to use original sources whenever possible3. For a budget figure, that means the budget itself, not a story about it. For a study, read the paper rather than the press release. When a manuscript cites many sources, a reference and citation check tests each citation against the passage in the source that should back it up.
Treat another outlet's report as a lead, not a confirmation. NPR's ethics handbook calls checking facts through "second sources, such as other news media outlets," that lack direct knowledge "an all-too-common pitfall."4 One of its case studies is NPR's own false 2011 report that Arizona congresswoman Gabby Giffords had been killed. NPR hadn't pressed its sources on whether they knew firsthand or were passing on what they'd heard.
Before you trust an unfamiliar website, find out who is behind it. For a 2017 report, Stanford researchers watched 10 professional fact-checkers, 10 historians and 25 Stanford students evaluate websites. The fact-checkers read laterally5: they scanned a site quickly, then opened new tabs to see what other sources said about it. The historians and students tended to stay on the site and were often fooled by a professional-looking name and logo.
Some records aren't online at all, so request them while you report, not the night before publication. For federal records, a FOIA request and deadline tracker helps you ask for a usable file format and track the agency's deadline.
Fact-check quotes, numbers and superlatives
Check every quote against the recording or your notes, which means knowing where each one came from. Borel asks writers to give the time stamp for any quote from an interview recording1, and page numbers for anything from a book. Then check the exact words, and that the right person said them.
Redo every calculation yourself. Make sure totals add up, each percentage uses the right base, and "millions" isn't really "billions." NPR's checklist also tells reporters to learn "percentage vs. percentage point"2: a rate that rises from 4% to 6% is up 2 percentage points, or 50%.
Superlatives need the most proof. Calling a contract the largest in a county's history means checking every earlier contract, not just the ones you remember.
The county will pay $4.2 million for the jail diversion pilot, the largest contract in the sheriff's history. "We can't wait another year," Commissioner Ana Marsh said Tuesday.
- The figure. Find $4.2 million in the signed contract or the board agenda, not a press release.
- The superlative. "Largest" needs the full contract history. Without it, attribute the claim or cut it.
- The name and title. Confirm the spelling of Ana Marsh and that she is still a commissioner.
- The quote. Match every word to your recording, and note the time stamp.
- The day. Check that she said it on Tuesday, and which date that Tuesday was.
Give anyone criticized a real chance to reply
Put any criticism of a named person or organization to them before you publish. The SPJ code tells journalists to "without exception, diligently provide fair opportunity"3 for the people they cover to respond to criticism or allegations of wrongdoing.
A vague request for comment isn't enough. Rolling Stone learned this with its 2014 story "A Rape on Campus," whose central account it later retracted. A Columbia Journalism School review found that seeking only "comment" cost the magazine the fraternity's detailed rebuttals before publication. Its lesson: routinely share specific, derogatory details6 with the people you report on.
Give them a real deadline and more than one way to reach you. If they don't answer, say so in the story.
Have a lawyer read serious allegations
If the story says or implies that a named person broke the law or behaved unethically, get a media lawyer's read before it runs. In the US, the Reporters Committee for Freedom of the Press runs a free Legal Hotline7 for journalists. Its attorneys can put you in touch with local lawyers, who often work free or at a discount.
Keep a log, then fix or cut
Record each claim as you clear it: the source, the date you checked it, and what changed. At many outlets, Borel writes, checkers use tracked changes and comments in Word or Google Docs1 to flag each fix and explain it to the writer and editor.
Then fix what's wrong, attribute what you can't confirm but still need, and cut the rest. Don't hold back a problem that undermines the story's premise; in the handbook's process, it goes to the editor immediately1. And when an error gets through anyway, the SPJ code asks journalists to correct it promptly and prominently3.
Before you publish
- Every name, title and age checked against the person or a record
- Every number recalculated from its original source
- Every quote matched to the recording, with the right speaker
- Each superlative proven, attributed or cut
- No fact resting only on another outlet's report
- Everyone criticized told the specifics and given time to reply
- A log of each claim, its source and the date you checked it
To get through the first pass faster, paste your draft into the tool at the top of this page. It comments on every claim with the source that would settle it, checks public sources online, and leaves each quote for you to match against your recording.
How it works
Paste the draft you're about to publish, or attach the file, and add a line about your sources if you have one. River reads it claim by claim and leaves a comment on each: what to confirm and which source would settle it. Where a budget, filing or official page online can confirm or contradict a claim, River reads it and links it. Your draft stays word for word, with the riskiest claims listed on top.
Paste your draft
Paste the story or attach the file. Add a line on your sources and notes if you have them.
River checks each claim
It comments on every checkable claim and checks public sources online that can confirm or contradict it.
Get your commented draft
Your draft stays word for word, with a summary on top listing the riskiest claims first.
Clear the flags
Paste your notes to update each status, ask for the calls still to make, or share it with your editor.
What you get
- A comment on every checkable claim, pinned to the sentence where it appears in your draft
- Each claim labeled by type, with exactly what to confirm and the best source to settle it
- A status on every claim: supported or contradicted with a linked source, or still unconfirmed
- Every quote flagged for checking against your recording, plus any that appears twice with different words
- Totals, percentages and comparisons recalculated, with any figure that doesn't add up flagged
- A summary on top: counts by status, then the riskiest claims, from contradictions to missing replies
Common questions
What should I fact-check in an article?
Fact-check every statement a reader could prove wrong. That means names and spellings, titles, ages, dates, places, numbers and the math behind them, and quotes and who said them. It also covers descriptions of people and events, claims about cause, and superlatives such as first or largest. Then check fairness: anyone the piece criticizes should have had a real chance to respond.
How do I fact-check an article with River?
Paste your near-final draft into the box at the top of this page, or attach the file, and add a note on your sources if you have one. River comments on every checkable claim, checks what public sources online can settle and lists the riskiest items on top. The commented draft opens in your free River workspace.
Will it rewrite my draft?
No. Your draft is copied into the document word for word, and every finding sits in a comment on the sentence it concerns. If a fix is obvious, such as a name spelled two different ways, the comment points it out and leaves the edit to you. You decide what changes before anything is published.
Can it confirm my quotes?
No, and the comment on every quote says so. Only your recording or notes can show what someone said, so each quote stays unconfirmed, with a reminder to check the exact words and the speaker. River can still catch a quote that appears twice with different wording, or the same words credited to two people.
Does it replace a human fact-checker or editor?
No. It does the slow first pass, listing the claims and checking what public sources online show, so your time goes to judgment and to what only you can verify. A story that accuses someone of wrongdoing still needs an editor's close read, and often a lawyer's. The Society of Professional Journalists' code holds journalists ethically responsible for their work, regardless of the tools and technologies used3.
What kinds of writing does it work on?
Any piece that makes factual claims: news stories, features, profiles, newsletters, press releases and nonfiction essays. It works best on a near-final draft, since claims you're still reporting will come back unconfirmed. In opinion pieces it checks the facts, never the argument. For a game story, start with the sports recap writer, which uses only the stats in your box score.
Is the fact-checking tool free?
Yes, it is free to start. Your commented draft opens in a River workspace, where you can work through the comments, share it with your editor or ask River to update them. Paid plans add more AI use and access to the most advanced models.
Sources
Knight Science Journalism at MIT. “The Fact-Checking Process.” ksjhandbook.org (opens in a new tab)
NPR. “An accuracy checklist to take with you.” npr.org (opens in a new tab)
Society of Professional Journalists. “SPJ’s Code of Ethics.” spj.org (opens in a new tab)
NPR. “Accuracy.” npr.org (opens in a new tab)
Stanford Graduate School of Education. “Stanford scholars observe 'experts' to see how they evaluate the credibility of information online.” ed.stanford.edu (opens in a new tab)
Columbia Journalism Review. “Rolling Stone’s investigation: ‘A failure that was avoidable’.” cjr.org (opens in a new tab)
Reporters Committee for Freedom of the Press. “A journalist’s guide to using the Reporters Committee’s free Legal Hotline.” rcfp.org (opens in a new tab)
Built by
Chandler Supple
Co-founder & CEO, River
Chandler has spent the last six years working in AI, building tools for millions of users and Fortune 100 companies. In 2025, he co-founded River to build a new kind of operating system for AI agents.