Citation Checker
Your bibliography
0 sourcesCitation checker is a free tool that scans your APA, MLA, Chicago or Harvard references, flags formatting errors, missing fields, wrong punctuation and italics, then shows the corrected version so your bibliography matches the current style edition exactly.
How do I use the citation checker?
Paste your reference list or a single citation into the box, choose the style and edition (APA 7th, MLA 9th, Chicago 18th or Harvard), then click check; the tool parses each entry, compares it against the style’s rules and returns flagged errors with a copy-ready correction. The workflow takes three steps.
- Paste your references. Drop in one citation or a whole bibliography — the checker splits entries on line breaks and analyses each separately.
- Select the style. Pick the exact edition your instructor requires, because APA 6th and APA 7th differ, and MLA 8th and 9th differ in small but graded ways.
- Review and fix. Each entry is marked correct, warning or error. Click a flag to see what rule it breaks and copy the fixed line straight into your paper.
If you have not built your references yet, generate clean ones first with the main tool below, then run them back through the checker as a final proofread.
What is a citation checker?
A citation checker is a proofreading tool that verifies whether a citation follows a specific style guide’s formatting rules — author order, date placement, capitalisation, italics, punctuation and required elements — rather than checking whether the source itself is real or trustworthy. It is a formatting validator, not a plagiarism scanner.
Students confuse three separate tools. A citation generator builds a reference from source details. A citation checker audits references you already have for style compliance. A plagiarism checker compares your prose against published text to find unoriginal passages. This page is the middle tool: it assumes you have citations and tells you where they break the rules.
What does the citation checker actually check?
The checker validates structural and typographic rules that graders penalise: element order, missing required fields, capitalisation style, italic scope, punctuation between elements, and consistency across the list. It compares each entry against the CSL definition for your chosen style and reports every deviation.
| Check | What it catches | Example fix |
|---|---|---|
| Author format | Wrong initials, missing ampersand, first name spelled out in APA | Smith, John → Smith, J. |
| Date placement | Year in the wrong position or missing parentheses | Moves year to (2023). in APA |
| Capitalisation | Title case where sentence case is required (APA titles) | The Great Migration → The great migration |
| Italics | Un-italicised journal, book or container titles | Italicises Nature, not the article title |
| Punctuation | Missing periods, stray commas, wrong DOI prefix | doi:10.1000 → https://doi.org/10.1000 |
| Missing fields | Absent publisher, page range, volume or access date | Flags a journal entry with no volume number |
Does it check in-text citations too?
Yes — the checker validates in-text citations against your reference list, confirming author-date pairs in APA match a reference entry and that MLA author-page signals point to a Works Cited item. It flags orphan citations that cite a source missing from the list, and unused references cited nowhere in the text.
The two dominant styles handle in-text signals differently, and mixing them is a common flagged error.
| Rule | APA 7th | MLA 9th |
|---|---|---|
| Signal | Author + year | Author + page |
| Parenthetical | (Garcia, 2022, p. 14) | (Garcia 14) |
| Narrative | Garcia (2022) argued… | Garcia argued… (14) |
| Two authors | (Lee & Park, 2021) | (Lee and Park 27) |
| Three or more | (Osei et al., 2020) | (Osei et al. 88) |
Note the graded details: APA uses an ampersand inside parentheses and a comma before the year, while MLA spells out “and” and omits any comma before the page number.
How does it check the reference list or Works Cited?
The checker parses each full-reference entry into its component elements, then rebuilds it to the target style so you can compare against your original character by character. It confirms hanging indents, alphabetical order, sentence versus title case, and the correct terminal punctuation for every source type.
Here is what a correctly formatted journal article looks like in each style — the exact output the checker will offer as a fix.
APA 7Garcia, M. (2022). Coastal wetlands as carbon sinks. Journal of Ecology, 110(4), 812–829. https://doi.org/10.1000/jecol.2022.0812
MLA 9Garcia, Maria. “Coastal Wetlands as Carbon Sinks.” Journal of Ecology, vol. 110, no. 4, 2022, pp. 812–29.
ChicagoGarcia, Maria. “Coastal Wetlands as Carbon Sinks.” Journal of Ecology 110, no. 4 (2022): 812–29.
The differences the checker enforces are precise. APA uses sentence case for the article and journal-title-only italics with a comma before the issue; MLA uses title case, spells “vol.” and “no.”, and abbreviates the second page number to 812–29; Chicago drops the “vol./no.” labels and puts the year in parentheses after the volume.
Books and web pages
APA 7 bookNdlovu, T. (2019). Rivers and memory (2nd ed.). Ashgate Press.
MLA 9 webChen, Wei. “Reading the Tides.” Ocean Review, 3 Mar. 2021, oceanreview.org/tides. Accessed 14 July 2026.
For web sources the checker verifies APA now omits “Retrieved from” before a URL, while MLA 9 makes the access date optional but recommends it for undated pages.
How accurate is it, and what are the limits?
The checker is reliable for structural and typographic rules that follow fixed patterns, but it cannot verify facts it has no access to — whether a page number is real, whether an author name is spelled correctly, or whether the source exists. Treat it as a fast formatting proofreader, not a source-verification service. Human judgement still matters.
- It cannot confirm accuracy of data. If you type the wrong year or a fake DOI, the format may pass while the content is wrong.
- Edge cases need judgement. Corporate authors, missing dates, translated titles and legal or government sources have exceptions no parser handles perfectly.
- Style guides update. Rules shift between editions; always match your instructor’s required edition, since a technically valid APA 6th entry fails an APA 7th assignment.
- It is not a plagiarism tool. A clean bibliography does not mean your text is free of uncited borrowing — that requires a separate similarity check.
Used well, the checker removes the mechanical errors — missing italics, stray commas, wrong initials — that cost easy marks, letting you focus on choosing and reading good sources.
Frequently asked questions
Is the citation checker free?
Yes. Every check is free and unlimited, with no account or email required. Paste as many references as you like and check them as often as you need.
Does it check APA and MLA?
Yes. The tool validates APA 7th, MLA 9th, Chicago 18th and Harvard, and you select the exact edition before scanning so the rules applied match your assignment.
Can it fix citations automatically?
It shows a corrected, copy-ready version of each flagged entry. You review the suggestion and paste it into your paper — nothing is changed without your confirmation.
Is a citation checker the same as a plagiarism checker?
No. A citation checker verifies formatting against a style guide, while a plagiarism checker compares your writing against published text to find unoriginal passages. They solve different problems.
Does it detect missing or fake sources?
It flags missing required fields and citations with no matching reference entry, but it cannot confirm a source is real or that details like the year and page number are accurate. Verify those yourself.
Will it catch mismatches between in-text citations and the reference list?
Yes. It cross-checks both directions, flagging in-text citations with no reference entry and references cited nowhere in your text.