GSTR-1 Multi-Platform Combiner

Multi-Platform GSTR-1 Combiner

Upload the GST reports you downloaded from Amazon, Flipkart, Meesho, JioMart. Get one combined GSTR-1 workbook ready for filing. No signup. Files auto-deleted.

Drop your platform files here

or click to browse

.xlsx or .csv, up to 25 MB each.

Amazon MTR CSV, Amazon GSTR1 xlsx, Flipkart xlsx.

    What you get

    One workbook, filing-ready.

    • GSTR1 FINAL sheet
      Table 7 B2C + Table 4 B2B, merged across platforms.
    • HSN, Docs, T14 ECO
      Table 12, 13, 14 populated when data is present.
    • Rate normalization
      Amazon fraction 0.18 and Flipkart 18 merged as one rate.
    • Validation report
      GSTIN consistency, totals reconciliation, decimal cleanup.
    • 100% free
    • No signup
    • Auto-deleted in 45 min
    • One workbook, filing-ready

    How the GSTR-1 combiner works

    1. 1

      Download reports from each platform

      Amazon Seller Central gives you an MTR B2C CSV and a monthly GSTR-1 xlsx. Flipkart Seller Hub gives a single GSTR-1 xlsx. Save each file to your computer.

    2. 2

      Drop them into the combiner

      You can drop as many platform files as you have. The tool detects each file, normalizes rates, and validates that all files belong to the same seller GSTIN.

    3. 3

      Backend merges by state and rate

      The processor groups B2C rows by state and tax rate, sums per group across platforms, splits IGST or CGST plus SGST correctly, and reconciles totals.

    4. 4

      Download the combined workbook

      You get one xlsx with GSTR1 FINAL, HSN, Documents Issued, and Table 14 ECO sheets. Empty tables are skipped. Copy each block into the GST portal to file.

    What the combiner handles for you

    • Rate normalization

      Amazon writes rates as fractions (0.18) and Flipkart writes percentages (18.0). Both are converted to a single canonical form before merging so 18 percent from Amazon and 18 percent from Flipkart correctly combine into one row.

    • State-based tax split

      For each B2C row, the tool checks whether Place of Supply is the seller state or a different state. Intra-state sales get CGST plus SGST split, inter-state sales get IGST, all computed from the seller GSTIN prefix.

    • Returns netting

      Flipkart already reports Aggregate Taxable as Gross minus Sales Return. Amazon MTR includes separate Cancel rows that the tool subtracts from their matching Shipment invoices before aggregating.

    • HSN merge with rate derivation

      Amazon HSN Summary provides tax rate per HSN. Flipkart HSN does not, so the tool back-derives rate from the tax over taxable ratio and snaps to the nearest standard slab before merging.

    • Table 14 for e-commerce operators

      Supplies made through each ECO are reported per ECO GSTIN in Table 14(a) so the portal can auto-match against the marketplace GSTR-8 filing.

    • Cross-file safety check

      The tool refuses to merge if the uploaded files carry different seller GSTINs. This prevents the accidental mixing of one seller with another.

    Frequently asked questions

    Which platforms are supported?

    Amazon (MTR B2C CSV and GSTR-1 xlsx) and Flipkart (GSTR-1 xlsx) are supported today. Meesho and JioMart will be added when we have samples to build the parser for those.

    Do I need to upload every file every month?

    Yes, upload each platform report for the current month. The tool merges only what you provide. If you only sold on Amazon this month, upload just those files.

    What if a platform sheet has no data this month?

    That is expected. Empty filing sections are skipped in the output so your workbook stays clean. If you had zero B2B sales, the B2B block simply does not appear.

    Are my uploaded files kept?

    No. Uploaded files and generated outputs are automatically deleted after the configured retention window (default 45 minutes). Do not upload the same file to a public shared computer.

    Can I file the output directly on the GST portal?

    The output is filing-ready in structure but you still copy each table into the GST portal offline utility or the online form. This tool does not connect to the GST portal.

    What if the files carry different seller GSTINs?

    The tool refuses the job and asks you to upload files for a single seller. This prevents accidentally combining one seller's data with another's.

    Amazon, Flipkart, and their respective names, logos, trademarks, and brand assets are the property of their respective owners. InvoiceTools.in is an independent utility website and is not affiliated with, endorsed by, sponsored by, or operated by Amazon or Flipkart. Brand names and logos are used only to identify compatible document formats.