ConvertAPI Alternative for Excel, CSV and JSON Conversion

ConvertAPI is a solid choice for developers who need one endpoint for a lot of document formats. It converts Word, PowerPoint, HTML and Excel to PDF, has a full set of PDF tools, and ships SDKs for C#, PHP, Node.js, JavaScript, Java, Ruby, Python and Go. If you are looking for an alternative, the reason is usually narrower: your product takes in spreadsheets from customers or partners, and turning those files into clean CSV, JSON or database rows is the part that keeps generating support tickets.

This comparison is for engineering leads and product owners who own that intake. It covers where ConvertAPI is the better buy, what its spreadsheet endpoints expose, how the plans compare at the same volume, and how to switch one endpoint without touching the rest of your integration.

When ConvertAPI is the right choice

Keep ConvertAPI if spreadsheets are one format among many. A contract platform that turns DOCX into PDF, merges PDFs and adds watermarks gets more from a general document API than from a spreadsheet specialist. The same goes for low volume. Plans listed on its AWS Marketplace page start with Developer at 35 USD per month for 1,000 conversions and files up to 200 MB, then Startup at 95 USD for 5,000, Growth at 175 USD for 15,000 and Business at 350 USD for 50,000 conversions and 1 GB files. Its own pricing page shows the same conversion counts and file sizes, a 20 percent discount for yearly billing and 250 free conversions at sign up. Extra conversions are billed automatically once the allowance runs out, so check the overage rate in your account before a large import.

If you convert a few hundred workbooks a month to PDF and nothing downstream parses the result, ConvertAPI's Developer plan is hard to beat on price.

What ConvertAPI exposes for Excel to CSV

The XLSX to CSV endpoint documents six parameters: the file, a password for protected workbooks, ActiveWorksheetOnly, WorksheetIndex, WorksheetName and StoreFile. That covers which sheets to convert. It does not list a delimiter, a character encoding, a date pattern or a way to keep text formatted numbers such as ZIP codes and SKUs intact. For many integrations that is fine. For a product that imports what customers upload, those missing settings are where the bugs come from:

• Delimiter. A European customer's numbers use commas as decimal separators, and a comma delimited file breaks every amount column. Semicolon or tab output avoids it.
• Encoding. Accented vendor names and non Latin characters need UTF-8, and if the CSV is opened in Excel on Windows afterward, UTF-8 with a byte order mark.
• Dates. Excel stores dates as serial numbers. Your parser wants one pattern such as YYYY-MM-DD, regardless of the regional settings of the person who saved the workbook.
• Identifiers. Account numbers, UPCs and ZIP codes must keep leading zeros and must never arrive as 1.23E+11.
• Shape. Often you do not want CSV at all. You want JSON objects keyed by header, or INSERT statements for a staging table.

XlsConverter's Excel conversion API takes all of those as request fields: sheet choice, delimiter, quote character, encoding including UTF-8 with BOM, JSON as an array of objects or rows, and SQL for MySQL, PostgreSQL or SQLite with a table name. The result is the same as in the web converter, so a support agent can reproduce a customer's file in the browser on XLSX to CSV and get the exact output the API returned.

ConvertAPI pricing compared with XlsConverter

The two products price API access very differently. ConvertAPI starts low and climbs with volume. XlsConverter has no small API tier: REST access starts with the API plan at 399 USD per month, or 199 USD per month billed yearly, with 50,000 conversions per billing period, files up to 1 GB, batches of 1,000 files and 10 API keys. Enterprise is 999 USD per month with 250,000 conversions and 2 GB files. The web app plans (Pro from 24 USD and Business from 74 USD per month billed yearly) do not include the API. All limits are on the pricing page.

The honest read: below roughly 15,000 conversions a month, ConvertAPI costs less. At 50,000 the gap closes, and on yearly billing XlsConverter is cheaper. ConvertAPI also has official SDKs where we offer plain REST. The case for switching rests on the spreadsheet specific output, not on price at low volume.

Two integrations priced out

Take a B2B SaaS product where customers upload price lists, rosters or inventory sheets, around 30,000 files a month. On ConvertAPI that is the Business plan at 350 USD per month. The conversion call is simple, but the code after it is not: a normalization layer that detects delimiters, repairs encodings, parses three date styles and pads stripped zeros, plus the support time when a customer's file slips through. With XlsConverter the API plan returns JSON keyed by header with dates already in one pattern, which is the use case behind our Excel to JSON API. Billed yearly that is 199 USD per month, and the normalization layer shrinks to schema validation.

Now take an operations team at a distributor with no developers to spare. Supplier workbooks arrive by email every week and have to land in the ERP as CSV, and the controller wants the weekly margin report emailed as a PDF every Monday. Building that on any API means writing an inbox poller, a scheduler and delivery code. On the Business plan it is two pipelines with no code at all, as described on the automatic Excel to CSV and automatic Excel to PDF pages. If some of those supplier documents arrive as scanned paper rather than spreadsheets, you would extract the data from the scans first and then feed the result into the same flow.

Which one should you pick

Pick ConvertAPI if your product converts many document types, if you need official SDKs in Java, .NET or Go, or if you run fewer than about 15,000 conversions a month and the output is a PDF that a person reads.

Pick a spreadsheet specific alternative if the CSV, JSON or SQL your integration produces is parsed by your own code or loaded into a database, if customer files from many locales keep breaking that parser, or if non-developers need to run recurring conversions without a ticket to engineering. If you are also weighing broader converters, the CloudConvert alternative comparison covers a credit based general API.

How to switch one endpoint from ConvertAPI

1. Collect ten real customer files, including the three that caused the most support tickets this quarter. Convert each one in the demo on the matching converter page and diff the output against what your parser expects.
2. Save the settings that worked as request fields: sheet, delimiter, encoding, date pattern, JSON shape or SQL dialect.
3. Replace the conversion call for one format pair behind a feature flag. POST the file to /v1/conversions with the target and options, and use the signed webhook or the status endpoint for large files.
4. Run both providers on live traffic for a week and compare row counts and parse errors per file.
5. Move the remaining spreadsheet pairs, and keep ConvertAPI for Word, PowerPoint and PDF tools if you use them. Running both is common and cheap at low ConvertAPI volume.

Most teams have the first format pair in production within a sprint. The part that takes longer is deleting the normalization code you no longer need.